Compression (waste) Joints

Cut a plastic waste pipe.

There is a point on the waste pipe that the fitting will reach when it is slipped over. As the pipe is cut an allowance has to be made for this extra measurement and it will ensure that the joint has a good watertight connection. Once this has been done you need to remove any burred metal, using a round file creating a smooth surface. Particular importance should be paid to the inner edge, as the waste-water that flows through could contain foreign material which can build up around a rough surface and block the pipe. These fittings are used by professionals such as Hornsey Plumbers.

For Plastic waste pipes

Compression fittings work as the name suggests work really well with this kind of material. The tight waterproof seal is created by compressing two rubber rings between the pipework and fitting. Standard plumbing fittings are now of the compression type since they allow the job to be assembled and also taken apart really easily, which can clear a blockage quickly.

Connecting the joint.

The usual arrangement in a waste system is a fitting the trap or bend, with a large plastic nut at each end, with a rubber ring or washer for both ends of the connection. Put the large nut over the pipe. Next the rubber ring or washer. If this has a taper, fit it so the taper goes to the fitting side. Lastly, insert the pipe in the fitting and tighten the nut. Hand tighten only, no tools! as the rubber washer is quite soft and can be adequately squeezed by hand. If a joint is leaking, it usually means one or other component is misaligned or misplaced, rather than the washer not being compressed enough. A Hornsey Plumber is experienced with compression fittings.


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