Silicone Rubber Round Plug Pipe Seal Hole Plug End Cap For PVC Pipe and Fittings

The "Pipes" variants are sized to seal the open end of a PVC pipe by fitting over or into the pipe bore. The "Connector" variants are sized to plug the socket opening of a PVC fitting or connector. Check your variant option name: if it says "Pipes," use it on a pipe end; if it says "Connector," use it on a fitting socket. The diameter listed in parentheses (e.g., 36.3mm or 41.3mm) is the nominal sealing diameter for that variant.

These silicone plugs are suitable for low-pressure testing (typically up to 0.1–0.2 MPa / 1–2 bar) to check for leaks in a newly assembled system. They are not rated as permanent pressure-bearing end caps. For high-pressure hydrostatic testing, use a threaded or solvent-welded test cap rated for the required test pressure.

These plugs are designed for temporary sealing, storage protection, and commissioning use. For a permanent sealed pipe end in a pressurized system, a solvent-welded PVC end cap is the correct solution. The silicone plug can remain in place for extended periods in unpressurized or low-pressure storage conditions without degradation.

Food-grade silicone rubber is widely used in potable water applications. However, the specific certification of this product for drinking water contact has not been confirmed. If your application involves potable water, contact us to confirm compliance with your local standards before use.

Different PVC110 pipe standards (e.g., GB standard vs. ISO standard) produce pipes with slightly different outer diameters. The 103.6mm variant suits one manufacturing tolerance and the 106.5mm variant suits another. Measure your pipe OD with calipers and select the variant closest to your measured dimension for the best compression fit.

Yes, provided the pipe or fitting OD or socket ID matches the plug's sealing diameter. The silicone rubber plug seals by compression against the pipe surface, so it is not limited to PVC — it will work on CPVC, ABS, or any smooth-bore pipe or fitting with a matching diameter. Verify the diameter before ordering.

Grip the plug body and pull firmly. For larger sizes (PVC110 and above), a slight twisting motion while pulling helps break the compression seal. No tools are required. If the plug has been in place for an extended period, a thin flat tool (such as a plastic spudger) can be used to break the seal at the edge without damaging the pipe.