{"product_id":"upvc-water-tank-overflow-pipe-fittings","title":"20mm~63mm Hi-Quality UPVC Water Tank Inlet Outlet Joint Overflow Pipe Fittings","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eUPVC Water Tank Overflow Pipe Fittings — Leak-Proof Inlet \u0026amp; Outlet Joints for Tanks \u0026amp; Cisterns\u003c\/h2\u003e\n\u003cp\u003eDealing with a leaking tank connection or a poorly sealed overflow outlet is one of the most frustrating plumbing headaches for DIYers and tradespeople alike. These UPVC water tank overflow pipe fittings are engineered for homeowners, plumbers, and workshop builders who need a reliable, watertight seal on cisterns, storage tanks, header tanks, and rainwater collection systems — without the need for specialist tools.\u003c\/p\u003e\n\u003cp\u003eEach fitting is manufactured from rigid UPVC (unplasticized polyvinyl chloride), offering excellent resistance to corrosion, UV exposure, and common household chemicals. The fittings span an inner diameter range of 20mm (~¾ in) to 63mm (~2½ in), with a threaded or push-fit connection style suited to standard tank wall thicknesses of typically 3–10mm. The body profile is compact, allowing installation in confined tank spaces.\u003c\/p\u003e\n\u003cp\u003eTypical applications include connecting overflow pipes on cold-water storage cisterns, fitting inlet or outlet joints on garden water butts and IBC tote tanks, and replacing worn bulkhead fittings on irrigation reservoirs. Long-tail use cases include \u003cem\u003eUPVC tank bulkhead fitting replacement\u003c\/em\u003e, \u003cem\u003eoverflow pipe connector for plastic water tank\u003c\/em\u003e, and \u003cem\u003ecistern outlet joint DIY repair\u003c\/em\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e🔧\u003c\/span\u003e \u003cstrong\u003eCompatibility:\u003c\/strong\u003e Suitable for UPVC, PVC, and ABS pipe systems. Fits standard tank wall thicknesses of typically 3–10mm. Compatible with cold-water storage cisterns, water butts, header tanks, and irrigation reservoirs. Not recommended for hot-water pressure systems above 60°C.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These UPVC Water Tank Overflow Pipe Fittings\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-list\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e💧\u003c\/span\u003e \u003cstrong\u003eWatertight Seal\u003c\/strong\u003e\n\u003cp\u003eThreaded design with rubber gasket seat creates a secure, leak-proof connection through tank walls — no solvent cement required for basic installations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e \u003cstrong\u003eCorrosion-Resistant UPVC Body\u003c\/strong\u003e\n\u003cp\u003eRigid UPVC construction resists rust, scale, and common household chemicals, making these fittings suitable for long-term outdoor and indoor tank installations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e \u003cstrong\u003eWide Size Range: 20mm–63mm\u003c\/strong\u003e\n\u003cp\u003eSix inner diameter options (20mm, 25mm, 32mm, 40mm, 50mm, 63mm) cover the most common pipe sizes used in residential and light commercial tank plumbing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003eTool-Free Hand-Tightening\u003c\/strong\u003e\n\u003cp\u003eDesigned for straightforward hand installation — simply drill the correct hole, insert the fitting, and tighten the lock nut to compress the gasket against the tank wall.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e♻️\u003c\/span\u003e \u003cstrong\u003eUV \u0026amp; Weather Resistant\u003c\/strong\u003e\n\u003cp\u003eUPVC material maintains structural integrity under prolonged UV exposure, making these fittings reliable for outdoor water butts, rainwater tanks, and garden cisterns.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🏠\u003c\/span\u003e \u003cstrong\u003eVersatile Inlet \/ Outlet \/ Overflow Use\u003c\/strong\u003e\n\u003cp\u003eFunctions as an inlet joint, outlet connector, or overflow pipe fitting depending on installation orientation — one fitting type covers multiple tank plumbing roles.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — UPVC Tank Pipe Fittings\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eUPVC (Unplasticized Polyvinyl Chloride)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eInner Diameter Options\u003c\/th\u003e\n\u003ctd\u003e20mm (~¾\"), 25mm (~1\"), 32mm (~1¼\"), 40mm (~1½\"), 50mm (~2\"), 63mm (~2½\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Tank Wall Thickness\u003c\/th\u003e\n\u003ctd\u003eTypically 3–10mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eConnection Type\u003c\/th\u003e\n\u003ctd\u003eThreaded bulkhead with lock nut and rubber gasket\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eColour \/ Finish\u003c\/th\u003e\n\u003ctd\u003eGrey (standard UPVC)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMax Operating Temperature\u003c\/th\u003e\n\u003ctd\u003eUp to 60°C (cold-water systems only)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePressure Rating\u003c\/th\u003e\n\u003ctd\u003eSuitable for gravity-fed \/ 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\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter (body)\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\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\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 inner diameter for my tank?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMatch the fitting's inner diameter to your pipe's outer diameter. For example, if your overflow pipe has a 20mm outer diameter, select the 20mm fitting. When in doubt, measure your existing pipe with calipers before ordering. Common residential overflow pipes are 20mm–32mm; larger storage tanks typically use 40mm–63mm outlets.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these fittings strong enough to hold without leaking under water pressure?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes — for gravity-fed and low-pressure cold-water systems. The threaded lock nut compresses the rubber gasket against both sides of the tank wall, creating a watertight seal. These fittings are not rated for mains-pressure hot-water systems or applications above 60°C.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill these fittings corrode or degrade over time?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eUPVC is inherently resistant to rust, scale, and most household chemicals. It also withstands prolonged UV exposure without becoming brittle, making it suitable for outdoor tanks and garden cisterns. Avoid contact with strong solvents or concentrated acids.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat tank materials are these fittings compatible with?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese fittings are compatible with UPVC, PVC, ABS, polyethylene (PE), and fibreglass tank walls. They are not recommended for metal tanks where a different sealing method may be required. Always ensure the tank wall thickness falls within the 3–10mm range for a proper gasket seal.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo I need any special tools to install these fittings?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eInstallation requires only a hole saw or step drill bit sized to match the fitting's body diameter, and a spanner or adjustable wrench to tighten the lock nut. No solvent cement or specialist plumbing tools are needed for standard tank-wall installations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these as both an inlet and an overflow fitting?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. The bulkhead design is orientation-neutral — it can function as an inlet joint, outlet connector, or overflow pipe fitting depending on how you route your pipework. Simply connect your supply or overflow pipe to the appropriate side of the fitting after installation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I know which size hole to drill in my tank?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThe hole diameter should match the outer body diameter of the fitting (not the inner pipe diameter). As a general guide, the body outer diameter is typically 6–10mm larger than the stated inner diameter. If you are unsure, contact us to confirm the exact body dimensions for your chosen size before drilling.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your inner diameter (Dia A) above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"Inner diameter 20mm \/ 1","offer_id":52332461621522,"sku":"GLFBWGYGLBZSJ021941x1","price":5.85,"currency_code":"USD","in_stock":true},{"title":"Inner diameter 25mm \/ 1","offer_id":52332461654290,"sku":"GLFBWGYGLBZSJ021942x1","price":8.16,"currency_code":"USD","in_stock":true},{"title":"Inner diameter 32mm \/ 1","offer_id":52332461687058,"sku":"GLFBWGYGLBZSJ021943x1","price":9.96,"currency_code":"USD","in_stock":true},{"title":"Inner diameter 40mm \/ 1","offer_id":52332461719826,"sku":"GLFBWGYGLBZSJ021944x1","price":14.47,"currency_code":"USD","in_stock":true},{"title":"Inner diameter 50mm \/ 1","offer_id":52332461752594,"sku":"GLFBWGYGLBZSJ021945x1","price":15.18,"currency_code":"USD","in_stock":true},{"title":"Inner diameter 63mm \/ 1","offer_id":52332461785362,"sku":"GLFBWGYGLBZSJ021946x1","price":17.49,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture6of6_20f03dfd-5b63-4ae1-b015-22fcf0c7e0ae.jpg?v=1782435101","url":"https:\/\/homediyer.com\/products\/upvc-water-tank-overflow-pipe-fittings","provider":"HomeDIYer","version":"1.0","type":"link"}