PVC Pipe Fittings 25-75mm Straight Coupler for Aquarium Water Supply 16-160mm

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.

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. Always verify that any PVC cement you use is also aquarium-safe.

Yes. 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.

The 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.

PVC 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.

Clean 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.

Each 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.