PVC Pipe Fittings White Connector Metric For Aquarium Fish Tank Various Parts

Measure the outer diameter (OD) of your existing pipe in millimeters. Match that measurement to the fitting size — for example, a pipe with a 20mm OD requires a 20mm fitting. Do not measure the inner diameter or use imperial pipe sizes, as they will not match metric fittings.

No. These are metric-sized fittings designed for metric PVC pipe. Imperial pipe schedules (such as ½" or ¾" Schedule 40) have different outer diameters and will not form a proper solvent-weld joint with these fittings. Always confirm your pipe's sizing standard before ordering.

Yes. Rigid PVC is chemically resistant to saltwater and is widely used in marine aquarium plumbing. Ensure all joints are properly solvent-welded and fully cured before introducing water. Ball valve fittings are particularly useful for isolating sections of a saltwater sump system.

Use a standard PVC solvent cement (also called PVC glue or CPVC cement for cold-water applications). Apply primer first if required by your local plumbing code. Allow the joint to cure fully — typically 15–30 minutes before handling and 24 hours before pressurizing — following the cement manufacturer's instructions.

The duckbill fittings are listed by nominal pipe connection size and internal valve opening. The Small and Medium variants both connect to 20mm pipe but differ in the duckbill valve opening dimension, affecting flow rate and back-pressure characteristics. The Large variant connects to 25mm pipe. Select based on your pipe size and the flow volume you need to manage.

A basic sump return line typically requires 2–4 elbows, 1–2 tees, and 1–2 ball valves per circuit. For a first-time build, ordering a 5-pack of each fitting type you need provides enough for the build plus spares for adjustments. Larger or multi-tank systems benefit from the 10- or 20-piece packs to reduce per-unit cost.

Yes. Rigid PVC is UV-resistant enough for short-term outdoor exposure, though prolonged direct sunlight over years can cause surface chalking. For permanent outdoor irrigation runs, consider wrapping exposed sections or routing them underground. These fittings work well for drip irrigation manifolds, pond pump outlets, and garden water distribution systems.