{"product_id":"pvc-straight-coupler-16-200mm-aquarium-water-supply","title":"PVC Pipe Fittings 25-75mm Straight Coupler for Aquarium Water Supply 16-160mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003ePVC Straight Couplers — Leak-Free Joints for Aquarium \u0026amp; Water Supply Lines\u003c\/h2\u003e\n\u003cp\u003eWhen a leaking joint floods your aquarium cabinet or interrupts an irrigation run, the culprit is almost always a coupler that wasn't sized or rated for the job. Hobbyist aquarists, pond builders, and DIY plumbers who need a reliable, solvent-weld-ready connection point will find these PVC straight couplers a straightforward fix.\u003c\/p\u003e\n\u003cp\u003eEach coupler is moulded from rigid PVC and is available in 14 metric diameters — 16 mm (≈ 0.63 in) through 200 mm (≈ 7.87 in) — in White, Blue, and Grey finishes. The socket ends accept standard metric PVC pipe for a flush, full-bore joint with no internal shoulder to restrict flow.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include connecting runs of aquarium return lines and sump plumbing, splicing irrigation laterals for garden drip systems, and extending PVC conduit or water-supply pipe in light-duty residential plumbing. The colour-coded options make it easy to distinguish circuits at a glance — a practical touch for multi-zone aquarium or hydroponics setups.\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:\u003c\/strong\u003e Designed for standard metric PVC pressure pipe (PN10 \/ PN16 class). Confirm your pipe's outer diameter before ordering. Not rated for compressed air or gas service.\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These PVC Straight Couplers\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-list\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003e14 Diameter Options\u003c\/strong\u003e — 16 mm to 200 mm covers the full range from small aquarium return lines to larger pond or irrigation mains.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎨\u003c\/span\u003e\u003cstrong\u003eThree Colour Choices\u003c\/strong\u003e — White, Blue, and Grey allow colour-coded circuit identification in multi-line systems.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e💧\u003c\/span\u003e\u003cstrong\u003eFull-Bore Socket Design\u003c\/strong\u003e — No internal shoulder means unrestricted flow and easier pipe insertion during assembly.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cstrong\u003eSolvent-Weld Ready\u003c\/strong\u003e — Smooth socket interior accepts standard PVC cement for a permanent, leak-free bond.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚖️\u003c\/span\u003e\u003cstrong\u003eRigid PVC Construction\u003c\/strong\u003e — Resists chlorinated water, mild fertiliser solutions, and UV exposure in covered outdoor installations.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cstrong\u003eSingle-Piece Packaging\u003c\/strong\u003e — Each unit is sold individually so you can order exactly the quantity your project requires without surplus.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — PVC Straight Coupler\u003c\/h2\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\u003eAvailable Diameters\u003c\/th\u003e\n\u003ctd\u003e16 mm, 20 mm, 25 mm, 32 mm, 40 mm, 50 mm, 63 mm, 75 mm, 90 mm, 110 mm, 125 mm, 140 mm, 160 mm, 200 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Colours\u003c\/th\u003e\n\u003ctd\u003eWhite, Blue, Grey\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eConnection Type\u003c\/th\u003e\n\u003ctd\u003eSolvent-weld socket (both ends)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFitting Type\u003c\/th\u003e\n\u003ctd\u003eStraight coupler (equal bore)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Pipe Standard\u003c\/th\u003e\n\u003ctd\u003eMetric PVC pressure pipe (PN10 \/ PN16)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRecommended Media\u003c\/th\u003e\n\u003ctd\u003eWater, aquarium-safe solutions, mild fertiliser solutions\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMax Working Pressure\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWall Thickness\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOverall Length\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePackaging Quantity\u003c\/th\u003e\n\u003ctd\u003e1 piece per unit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the right diameter coupler for my pipe?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMatch the coupler diameter to your pipe's \u003cstrong\u003eouter diameter (OD)\u003c\/strong\u003e, not the nominal bore. For example, a pipe labelled \"20 mm\" typically has a 20 mm OD and fits the 20 mm coupler. If you are unsure, measure the outside of your pipe with calipers before ordering.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these couplers suitable for aquarium use with fish?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eRigid PVC is widely used in aquarium plumbing because it does not leach plasticisers into the water once fully cured. Allow solvent-weld joints to cure for at least 24 hours and flush the line before introducing livestock. Always verify that any PVC cement you use is also aquarium-safe.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these couplers for irrigation or garden water supply?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. These straight couplers are well-suited for connecting metric PVC irrigation laterals and drip-system mains. They handle the low-to-moderate pressures typical of residential garden irrigation. For buried runs, ensure the pipe and coupler are rated for the soil load and working pressure of your system.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the maximum pressure rating?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe working pressure varies by diameter — larger diameters generally carry a lower pressure rating at the same wall thickness. Typical PN10-class PVC fittings are rated to 10 bar (145 psi) at 20 °C for smaller sizes, decreasing for larger diameters. Contact us to confirm the rating for your specific size before use in pressurised systems.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo these couplers resist corrosion and chemicals?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003ePVC has good resistance to chlorinated tap water, mild acids, and dilute fertiliser solutions commonly used in hydroponics and aquaponics. It is not suitable for concentrated solvents, aromatic hydrocarbons, or compressed gas service. For aggressive chemical environments, contact us to confirm compatibility.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I make a leak-free solvent-weld joint?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eClean and dry both the pipe end and the coupler socket. Apply PVC primer to both surfaces, then brush PVC cement evenly on the pipe OD and the socket interior. Insert the pipe with a slight twist and hold firmly for 30 seconds. Avoid disturbing the joint for at least 1 hour, and allow a full 24-hour cure before pressurising the line.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I get a bulk quantity discount if I need many couplers?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eEach listing is sold per piece so you can order exactly what you need. If you require a large quantity for a commercial or wholesale project, please contact us directly and we will be happy to discuss options.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-cta\"\u003e\n🛒 Select your Diameter and Colour above, then add to cart.\n\u003c\/div\u003e\n\n\u003c\/div\u003e\n\n\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 diameter coupler for my pipe?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Match the coupler diameter to your pipe's outer diameter (OD), not the nominal bore. For example, a pipe labelled '20 mm' typically has a 20 mm OD and fits the 20 mm coupler. If you are unsure, measure the outside of your pipe with calipers before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these couplers suitable for aquarium use with fish?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Rigid PVC is widely used in aquarium plumbing because it does not leach plasticisers into the water once fully cured. Allow solvent-weld joints to cure for at least 24 hours and flush the line before introducing livestock.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these couplers for irrigation or garden water supply?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. These straight couplers are well-suited for connecting metric PVC irrigation laterals and drip-system mains. 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It is not suitable for concentrated solvents, aromatic hydrocarbons, or compressed gas service.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I make a leak-free solvent-weld joint?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Clean and dry both surfaces. Apply PVC primer, then brush PVC cement on the pipe OD and socket interior. Insert the pipe with a slight twist and hold for 30 seconds. Allow 24-hour cure before pressurising.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I get a bulk quantity discount if I need many couplers?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Each listing is sold per piece. If you require a large quantity for a commercial or wholesale project, please contact us directly to discuss options.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"16mm \/ White \/ 1 Pcs","offer_id":52331835228434,"sku":"GYWXWGLBZSJ019383x1","price":1.84,"currency_code":"USD","in_stock":true},{"title":"20mm \/ White \/ 1 Pcs","offer_id":52331835261202,"sku":"GYWXWGLBZSJ019384x1","price":1.84,"currency_code":"USD","in_stock":true},{"title":"25mm \/ White \/ 1 Pcs","offer_id":52331835293970,"sku":"GYWXWGLBZSJ019385x1","price":1.84,"currency_code":"USD","in_stock":true},{"title":"32mm \/ White \/ 1 Pcs","offer_id":52331835326738,"sku":"GYWXWGLBZSJ019386x1","price":2.03,"currency_code":"USD","in_stock":true},{"title":"40mm \/ White \/ 1 Pcs","offer_id":52331835359506,"sku":"GYWXWGLBZSJ019387x1","price":2.43,"currency_code":"USD","in_stock":true},{"title":"50mm \/ White \/ 1 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