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Professional Building Supplies£0.61Visit shop Hydrodif Mdpe Pipe Liner - 25Mm
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B&Q£10.09Visit shop B&Q - Hydrodif Mdpe Pipe Liner25mmPolypropylene Stiffener For Compression FittingsWras ApprovedSingle Pack.
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The Hydrodif MDPE Pipe Liner is an essential component for professional plumbers and DIY enthusiasts working with 25mm Medium Density Polyethylene (MDPE) pipe systems. Its primary function is to act as a structural stiffener, preventing pipe wall deformation during the installation of compression fittings to ensure a permanent, leak-resistant connection in potable water setups. While this liner is a critical safety and performance feature for long-term reliability, it must be matched precisely to the internal diameter of 25mm MDPE pipes to function correctly.
| Model Part Number | MD25I |
|---|---|
| Brand | Hydrodiff |
Yes, it is highly recommended and standard practice for all compression fittings to prevent pipe deformation and ensure a lasting, leak-free seal.
No, this liner is designed specifically for 25mm MDPE pipe and will not provide the correct structural reinforcement for other sizes.
Yes, it is WRAS approved, meaning it is certified for use in systems carrying potable water.
No special tools are required, though a good quality pipe cutter is recommended to ensure a clean, square end on the pipe.
It is best practice to use a fresh liner if you disassemble a connection, as the original liner may have been compressed and may not provide the same tight fit upon re-installation.
Ensure the pipe was cut squarely and the liner is fully seated inside the pipe end. Check for debris or scratches on the pipe surface.
Ensure you are using genuine 25mm MDPE pipe. If the pipe is cold, warming the end slightly can make insertion easier.
Verify that the split ring is correctly placed and the nut is properly threaded. The liner should make the pipe end feel rigid rather than spongy.
Installation of the Hydrodif MDPE Pipe Liner is straightforward. Ensure the end of the 25mm MDPE pipe is cut squarely and free of burrs or jagged edges. Use a pipe cutter for the cleanest results. Once the pipe is prepared, push the liner fully into the pipe until it sits flush against the inner wall. Ensure that the compression fitting is tightened until firm, but avoid over-tightening, as the liner already provides the necessary internal support. For ongoing care, ensure that the ground or support structure around the pipe is stable, as the liner is designed for high-stress connections but cannot compensate for extreme ground shifting or external impact damage.
