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When a leaking joint threatens your pond build, aquarium plumbing, or water storage system, the fitting you choose matters. These straight coupling PVC metric plumbing fittings are designed for makers, pond builders, and DIY plumbers who need a secure, solvent-weld connection that holds under continuous water pressure without tools or clamps.
Each coupling is manufactured from rigid PVC (polyvinyl chloride), offering a smooth bore interior and uniform wall thickness. The metric sizing range spans 16 mm (approx. 5/8 in) through 200 mm (approx. 7-7/8 in), covering the most common pipe diameters used in metric plumbing systems. Available in White, Blue, and Grey finishes to support colour-coded pipework or aesthetic matching.
Typical applications include koi pond filtration loops and return lines, rainwater harvesting tank manifolds, aquaponics grow-bed supply runs, and irrigation header pipes — anywhere a straight inline join is needed on metric solvent-weld PVC pipe.
Available from 16 mm through 200 mm to match standard metric OD pipe without adapters or reducers.
White, Blue, and Grey finishes allow colour-coded pipework for easy system identification in complex installations.
Smooth, parallel socket bores accept standard PVC solvent cement for a chemically fused, leak-free joint.
Rigid PVC resists chlorinated water, mild acids, and UV degradation, making it suitable for both indoor and outdoor installations.
Order as 1 pc, 2 pcs, or 3 pcs per listing to match your project scope and reduce leftover stock.
No threading, no clamps — apply solvent cement, push, and hold for a permanent connection in seconds.
| Material | Rigid PVC (Polyvinyl Chloride) |
|---|---|
| Connection Type | Solvent Weld (Socket) |
| Size Range | 16 mm – 200 mm (approx. 5/8 in – 7-7/8 in) |
| Available Colours | White, Blue, Grey |
| Pack Options | 1 pc, 2 pcs, 3 pcs |
| Wall Thickness | See variant options |
| Pressure Rating | See variant options |
| Temperature Range | Typically 0 °C – 60 °C (32 °F – 140 °F) |
| Surface Finish | Smooth bore interior |
| Suitable For | Tanks, ponds, aquaponics, irrigation, general plumbing |
Match the coupling size to the outer diameter (OD) of your existing metric PVC pipe. Common pond return lines use 20–50 mm; larger filter manifolds and tank inlets often use 63–110 mm. If you are unsure, measure the outside of your pipe with calipers before ordering.
No. These couplings are sized to metric OD PVC pipe standards. Imperial pipe has different outer diameters and will not form a reliable solvent-weld joint. Use metric pipe throughout your system for a consistent fit.
A correctly made solvent-weld joint chemically fuses the fitting and pipe into a single piece, typically exceeding the rated pressure of the pipe itself. Push-fit connections rely on O-ring seals and are generally rated for lower pressures. For permanent pond and tank installations, solvent weld is the preferred method.
Yes. Rigid PVC has good resistance to chlorinated water, common pond treatments, and mild chemical solutions. It is widely used in aquaculture and water treatment applications. Avoid contact with strong solvents or concentrated oxidising acids outside of the solvent cement used during assembly.
PVC has moderate UV resistance for short-term outdoor exposure. For long-term outdoor installations in direct sunlight, consider painting the pipe run with a water-based paint or routing pipework in a shaded channel to extend service life.
The multi-pack options offer a lower per-unit cost and are useful when you need spares on hand or are plumbing multiple identical connection points. For a single repair or prototype run, the 1 pc option keeps your order lean. For larger builds with several inline joins, the 2 pc or 3 pc packs reduce reorder frequency.
Use a PVC solvent cement (also called PVC glue or CPVC cement) rated for the pipe pressure class in your system. Apply a thin, even coat to both the pipe end and the socket interior, push firmly together with a slight twist, and hold for 30 seconds. Allow the joint to cure fully before pressurising — typically 1–2 hours at room temperature for low-pressure systems.
