John Guest MDPE Compression Straight Coupling - 25mm in Blue

WRAS (Water Regulations Advisory Scheme) approval means the product has been rigorously tested and meets the highest standards for use in contact with drinking water in the UK. It ensures the product does not waste, misuse, or contaminate water.

No, this coupling is specifically designed for 25mm MDPE (Medium Density Polyethylene) pipe. Using it with other pipe materials or sizes may result in leaks or failure.

No specialist tools are required. While wrenches are recommended for tightening the compression nut securely, the connection is made without soldering, glue, or crimping tools.

A leak-free connection relies on proper pipe preparation (clean, square cuts, no burrs) and ensuring the pipe is fully inserted before tightening the compression nut. Avoid over-tightening, which can damage the pipe or fitting.

When installed correctly in suitable applications, these fittings are designed for a long service life, often exceeding 25-50 years, due to their robust construction and corrosion-resistant materials.

Compression fittings can sometimes be removed and reused, but it's not always guaranteed to be leak-free upon reinstallation. It's often recommended to use a new fitting for critical applications to ensure reliability.

Check that the pipe was fully inserted into the fitting. Ensure the pipe ends were cut square and free from burrs. The compression nut may need to be tightened slightly further, ensuring not to over-tighten.

Ensure the pipe end is clean, round, and free of kinks. Lightly chamfering the pipe edge can help. Do not force the pipe; if resistance is significant, re-check pipe condition and fitting integrity.

Inspect the fitting for visible damage. If damaged, replace it with a new fitting. Ensure correct installation techniques are used to avoid stress on the fitting.