{"product_id":"pvc-metric-pipe-fittings-aquarium-fish-tank","title":"PVC Metric Pipe Fittings for Aquarium \u0026 Fish Tank — Straight, Elbow, T-piece, Ball Valve \u0026 More","description":"\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I choose the right inner diameter for my aquarium tubing?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure the outer diameter of your existing tubing, then select the fitting whose inner diameter matches. These fittings are available in 16mm (5\/8\\u201d), 20mm (\\u22483\/4\\u201d), 25mm (\\u22481\\u201d), and 32mm (\\u22481-1\/4\\u201d). When in doubt, size up — a slightly larger fitting is easier to seal than one that\\u2019s too tight.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these fittings strong enough for pressurized aquarium filter systems?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"PVC fittings of this type are generally rated for low-to-moderate pressure applications typical of aquarium filtration and circulation systems. They are not intended for high-pressure industrial plumbing. For canister filters and sump systems, they typically perform reliably within normal operating pressures.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can these fittings be used outdoors or in pond setups?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"PVC is generally resistant to UV degradation and moisture, making it suitable for outdoor pond plumbing in most climates. However, prolonged direct UV exposure over many years may cause gradual brittleness. For fully outdoor installations, consider shading the fittings or using UV-stabilized PVC where possible.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What thread or connection standard do these fittings use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These are metric-sized slip-fit (push-on) PVC fittings designed to connect to standard metric PVC tubing. They do not use NPT or BSP threaded connections. Always confirm your tubing\\u2019s outer diameter matches the fitting\\u2019s inner diameter before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Which fitting type should I choose for my setup?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Choose based on your plumbing layout: Straight connectors join two tubes in a line; 90\\u00b0 and 45\\u00b0 elbows redirect flow around corners; T-pieces split or merge flow; ball valves control flow on\/off; bulkhead joints pass tubing through tank walls; union connectors allow easy disconnect for maintenance; vent and tube caps seal open ends; angle connectors handle wall-entry angles.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is PVC safe for freshwater and saltwater aquariums?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"PVC is widely used in both freshwater and saltwater aquarium plumbing. It is generally considered inert and non-toxic once fully cured. These fittings are not treated with any coatings that would leach into water under normal aquarium conditions. If you have concerns about a specific species or sensitive reef environment, consult your aquarium specialist.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do I need PVC cement or glue to install these fittings?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"For permanent, leak-free connections, PVC solvent cement is recommended. For temporary or serviceable connections (such as with union connectors), a friction fit with silicone sealant may be sufficient. Always test connections before filling your tank.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\n\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003ePVC Metric Pipe Fittings for Aquarium \u0026amp; Fish Tank — Every Connection You Need in One Place\u003c\/h2\u003e\n    \u003cp\u003eIf you've ever spent an afternoon hunting for the right metric PVC fitting to complete your aquarium sump, canister filter loop, or pond circulation system — only to find hardware stores stocking nothing but imperial sizes — you know the frustration. DIY aquarists, reef hobbyists, and pond builders who work with metric tubing need a reliable source for properly sized connectors that actually fit without adapters or improvised workarounds.\u003c\/p\u003e\n    \u003cp\u003eThis listing covers a complete range of metric PVC pipe fittings compatible with standard metric tubing in four inner diameter sizes: 16mm (5\/8\"), 20mm (≈3\/4\"), 25mm (≈1\"), and 32mm (≈1-1\/4\"). Available fitting types include Straight Connectors, 90° Elbows, 45° Elbows, T-pieces, Vent Caps, Tube Caps, Ball Valves, Straight Bulkhead Joints, Elbow Bulkhead Joints, Union Connectors, and Angle Connectors — all made from rigid PVC for durability in wet environments. Each listing is sold per piece (1 pcs) so you can order exactly what your build requires.\u003c\/p\u003e\n    \u003cp\u003eThese fittings are well-suited for aquarium sump plumbing, freshwater and saltwater fish tank filtration loops, DIY pond pump systems, hydroponic water distribution lines, and aquaponics setups where metric tubing is the standard. Whether you're routing flow around a tight corner with a 90° elbow or installing a ball valve for easy maintenance shutoff, these metric PVC pipe fittings give you the flexibility to build a clean, serviceable system.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-compat\"\u003e\n    \u003cspan class=\"hdiy-compat-icon\"\u003e🔵\u003c\/span\u003e\n    \u003cstrong\u003eCompatibility Notice:\u003c\/strong\u003e These are metric slip-fit PVC fittings. They are designed for metric PVC tubing — not NPT or BSP threaded pipe. Please verify your tubing's outer diameter matches the fitting's inner diameter (16mm, 20mm, 25mm, or 32mm) before ordering. Contact us to confirm if you are unsure.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e✅ Key Features of These Metric PVC Aquarium Pipe Fittings\u003c\/h2\u003e\n  \u003cul class=\"hdiy-features\"\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003e11 Fitting Types in One Listing\u003c\/strong\u003e — Straight connectors, 90° and 45° elbows, T-pieces, ball valves, bulkhead joints, union connectors, angle connectors, vent caps, and tube caps cover virtually every routing need in an aquarium or pond plumbing system.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eFour Metric Sizes Available\u003c\/strong\u003e — Inner diameters of 16mm (5\/8\"), 20mm (≈3\/4\"), 25mm (≈1\"), and 32mm (≈1-1\/4\") match the most common metric tubing used in aquarium filtration and sump builds.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e💧\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eRigid PVC Construction\u003c\/strong\u003e — PVC is resistant to corrosion, moisture, and the biological environment of freshwater and saltwater tanks, making it a dependable material for long-term aquarium plumbing installations.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eBall Valve for Flow Control\u003c\/strong\u003e — The included ball valve option allows you to shut off or regulate water flow to individual lines without draining the system — essential for canister filter maintenance and sump management.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🏗️\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eBulkhead Joints for Tank Wall Pass-Throughs\u003c\/strong\u003e — Straight and elbow bulkhead joints are designed to create watertight penetrations through aquarium walls or sump baffles, a critical component in overflow and return line builds.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔓\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003eUnion Connectors for Serviceable Plumbing\u003c\/strong\u003e — Union connectors allow you to disconnect and reconnect sections of your plumbing without cutting pipe, making equipment swaps and filter cleanings significantly easier.\u003c\/span\u003e\n\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003e📐 Technical Specifications — Metric PVC Aquarium Pipe Fittings\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eRigid PVC (Polyvinyl Chloride)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eInner Diameter Options\u003c\/th\u003e\n\u003ctd\u003e16mm (5\/8\") \/ 20mm (≈3\/4\") \/ 25mm (≈1\") \/ 32mm (≈1-1\/4\")\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFitting Types\u003c\/th\u003e\n\u003ctd\u003eStraight Connector, 90° Elbow, 45° Elbow, T-piece, Vent Cap, Tube Cap, Ball Valve, Straight Bulkhead Joint, Elbow Bulkhead Joint, Union Connector, Angle Connector\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eConnection Standard\u003c\/th\u003e\n\u003ctd\u003eMetric slip-fit (push-on); not NPT or BSP threaded\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eSuitable Fluids\u003c\/th\u003e\n\u003ctd\u003eFresh water, salt water, non-aggressive aqueous solutions\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eRecommended Applications\u003c\/th\u003e\n\u003ctd\u003eAquarium filtration, sump plumbing, pond circulation, hydroponics, aquaponics\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eColor\/Finish\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePressure Rating\u003c\/th\u003e\n\u003ctd\u003eContact us to confirm — suitable for typical aquarium low-pressure systems\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 piece (pcs) per variant selected\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-note\"\u003e\n    \u003cspan class=\"hdiy-note-icon\"\u003e⚠️\u003c\/span\u003e\n    \u003cstrong\u003eSizing Note:\u003c\/strong\u003e Not all fitting types are available in all four sizes. The 45° Elbow, Vent Cap, Tube Cap, and Angle Connector start at 20mm. Please select your fitting type first, then confirm the available inner diameter options in the variant selector above.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-faq\"\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose the right inner diameter for my aquarium tubing?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eMeasure the outer diameter of your existing tubing, then select the fitting whose inner diameter matches. These fittings are available in 16mm (5\/8\"), 20mm (≈3\/4\"), 25mm (≈1\"), and 32mm (≈1-1\/4\"). When in doubt, size up — a slightly larger fitting is easier to seal than one that's too tight. If you're starting a new build, 20mm and 25mm are the most commonly used sizes for aquarium return and drain lines.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these fittings strong enough for pressurized aquarium filter systems?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003ePVC fittings of this type are generally rated for low-to-moderate pressure applications typical of aquarium filtration and circulation systems. They are not intended for high-pressure industrial plumbing. For canister filters and sump systems, they typically perform reliably within normal operating pressures. Contact us to confirm specific pressure ratings for your application.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan these fittings be used outdoors or in pond setups?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003ePVC is generally resistant to UV degradation and moisture, making it suitable for outdoor pond plumbing in most climates. However, prolonged direct UV exposure over many years may cause gradual brittleness. For fully outdoor installations, consider shading the fittings or using UV-stabilized PVC where possible. In most pond pump and filter setups, these fittings perform reliably.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat thread or connection standard do these fittings use?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eThese are metric-sized slip-fit (push-on) PVC fittings designed to connect to standard metric PVC tubing. They do not use NPT (National Pipe Thread) or BSP (British Standard Pipe) threaded connections. Always confirm your tubing's outer diameter matches the fitting's inner diameter before ordering. If you need to adapt from metric to NPT or BSP, additional adapter fittings would be required.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhich fitting type should I choose for my aquarium plumbing layout?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eChoose based on your plumbing layout:\u003c\/p\u003e\n        \u003cul class=\"hdiy-list\"\u003e\n          \u003cli\u003e\n\u003cstrong\u003eStraight Connector\u003c\/strong\u003e — joins two tubes in a straight line\u003c\/li\u003e\n          \u003cli\u003e\n\u003cstrong\u003e90° \/ 45° Elbow\u003c\/strong\u003e — redirects flow around corners at 90 or 45 degrees\u003c\/li\u003e\n          \u003cli\u003e\n\u003cstrong\u003eT-piece\u003c\/strong\u003e — splits or merges flow from two directions\u003c\/li\u003e\n          \u003cli\u003e\n\u003cstrong\u003eBall Valve\u003c\/strong\u003e — controls flow on\/off for maintenance shutoff\u003c\/li\u003e\n          \u003cli\u003e\n\u003cstrong\u003eStraight \/ Elbow Bulkhead Joint\u003c\/strong\u003e — passes tubing through tank walls or sump baffles\u003c\/li\u003e\n          \u003cli\u003e\n\u003cstrong\u003eUnion Connector\u003c\/strong\u003e — allows easy disconnect without cutting pipe\u003c\/li\u003e\n          \u003cli\u003e\n\u003cstrong\u003eAngle Connector\u003c\/strong\u003e — handles angled wall-entry connections\u003c\/li\u003e\n          \u003cli\u003e\n\u003cstrong\u003eVent Cap \/ Tube Cap\u003c\/strong\u003e — seals open tube ends\u003c\/li\u003e\n        \u003c\/ul\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eIs PVC safe for freshwater and saltwater aquariums?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003ePVC is widely used in both freshwater and saltwater aquarium plumbing and is generally considered inert and non-toxic once fully cured. These fittings are not treated with coatings that would leach into water under normal aquarium conditions. If you maintain a sensitive reef environment or keep particularly delicate species, consult your aquarium specialist for additional guidance.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eDo I need PVC cement or glue to install these fittings?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\n        \u003cp\u003eFor permanent, leak-free connections, PVC solvent cement is recommended and will create a strong bond between the fitting and tubing. For temporary or serviceable connections — such as those using union connectors — a friction fit with silicone sealant may be sufficient. Always test all connections with water before filling your tank with fish or livestock.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-cta\"\u003e\n    🛒 Select your fitting type and inner diameter above, then add to cart — ships from our US warehouse.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"HomeDIYer","offers":[{"title":"Straight connector \/ 16mm-Straight connector \/ 1pcs","offer_id":52331843879186,"sku":"GLFBDMHFFXD26030516x1","price":7.19,"currency_code":"USD","in_stock":true},{"title":"Straight connector \/ 20mm-Straight connector \/ 1pcs","offer_id":52331843911954,"sku":"GLFBDMHFFXD26030517x1","price":7.43,"currency_code":"USD","in_stock":true},{"title":"Straight connector \/ 25mm-Straight connector \/ 1pcs","offer_id":52331843944722,"sku":"GLFBDMHFFXD26030518x1","price":7.75,"currency_code":"USD","in_stock":true},{"title":"Straight connector \/ 32mm-Straight connector \/ 1pcs","offer_id":52331843977490,"sku":"GLFBDMHFFXD26030519x1","price":8.15,"currency_code":"USD","in_stock":true},{"title":"90° Elbow \/ 16mm-90° Elbow \/ 1pcs","offer_id":52331844010258,"sku":"GLFBDMHFFXD26030520x1","price":7.19,"currency_code":"USD","in_stock":true},{"title":"90° Elbow \/ 20mm-90° Elbow \/ 1pcs","offer_id":52331844043026,"sku":"GLFBDMHFFXD26030521x1","price":7.43,"currency_code":"USD","in_stock":true},{"title":"90° Elbow \/ 25mm-90° Elbow \/ 1pcs","offer_id":52331844075794,"sku":"GLFBDMHFFXD26030522x1","price":7.75,"currency_code":"USD","in_stock":true},{"title":"90° Elbow \/ 32mm-90° Elbow \/ 1pcs","offer_id":52331844108562,"sku":"GLFBDMHFFXD26030523x1","price":8.64,"currency_code":"USD","in_stock":true},{"title":"T-piece \/ 16mm-T-piece \/ 1pcs","offer_id":52331844141330,"sku":"GLFBDMHFFXD26030524x1","price":7.19,"currency_code":"USD","in_stock":true},{"title":"T-piece \/ 20mm-T-piece \/ 1pcs","offer_id":52331844174098,"sku":"GLFBDMHFFXD26030525x1","price":7.43,"currency_code":"USD","in_stock":true},{"title":"T-piece \/ 25mm-T-piece \/ 1pcs","offer_id":52331844206866,"sku":"GLFBDMHFFXD26030526x1","price":8.34,"currency_code":"USD","in_stock":true},{"title":"T-piece \/ 32mm-T-piece \/ 1pcs","offer_id":52331844239634,"sku":"GLFBDMHFFXD26030527x1","price":11.1,"currency_code":"USD","in_stock":true},{"title":"45° Elbow \/ 20mm-45° Elbow \/ 1pcs","offer_id":52331844272402,"sku":"GLFBDMHFFXD26030528x1","price":7.43,"currency_code":"USD","in_stock":true},{"title":"45° Elbow \/ 25mm-45° Elbow \/ 1pcs","offer_id":52331844305170,"sku":"GLFBDMHFFXD26030529x1","price":7.75,"currency_code":"USD","in_stock":true},{"title":"45° Elbow \/ 32mm-45° Elbow \/ 1pcs","offer_id":52331844337938,"sku":"GLFBDMHFFXD26030530x1","price":8.64,"currency_code":"USD","in_stock":true},{"title":"Vent cap \/ 20mm-Vent cap \/ 1pcs","offer_id":52331844370706,"sku":"GLFBDMHFFXD26030531x1","price":7.43,"currency_code":"USD","in_stock":true},{"title":"Vent cap \/ 25mm-Vent cap \/ 1pcs","offer_id":52331844403474,"sku":"GLFBDMHFFXD26030532x1","price":7.75,"currency_code":"USD","in_stock":true},{"title":"Vent cap \/ 32mm-Vent cap \/ 1pcs","offer_id":52331844436242,"sku":"GLFBDMHFFXD26030533x1","price":8.15,"currency_code":"USD","in_stock":true},{"title":"Tube cap \/ 20mm-Tube cap \/ 1pcs","offer_id":52331844469010,"sku":"GLFBDMHFFXD26030534x1","price":7.43,"currency_code":"USD","in_stock":true},{"title":"Tube cap \/ 25mm-Tube cap \/ 1pcs","offer_id":52331844501778,"sku":"GLFBDMHFFXD26030535x1","price":7.75,"currency_code":"USD","in_stock":true},{"title":"Tube cap \/ 32mm-Tube cap \/ 1pcs","offer_id":52331844534546,"sku":"GLFBDMHFFXD26030536x1","price":8.15,"currency_code":"USD","in_stock":true},{"title":"Ball valve \/ 20mm-Ball valve \/ 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