How to Replace Soil Plumbing Pipes

Soil pipes are replaced in the same way as plastic waste pipes but are much bigger – about 100mm (4in) in diameter- so they take longer to fit. They also have some different fittings, such as a soil branch for use where the outlet pipe joins the stack, and access fittings with bolted removable plates for inspection. There are also special connectors to link to the WC pan, via a special gasket, and to link to the underground drainage system which is traditionally made of vitrified clay.

The accurate moulding of the fittings and the ease of assembly means that you can confidently tackle complete replacement of a soil system.

soil plumbing pipes How to Replace Soil Plumbing Pipes

1. Soil pipes are joined in the same way as their narrower waste counterparts, but as they’re bigger take special care with cutting and chamfering.

2. You have got a lot more area to cover with the solvent cement so you must work speedily – but don’t neglect accurate application.

3. The soil branch pipe has a swept entry into the main stack fitting. This is one of the most important joints in the system, so make sure you get it right.

4. When you finally push the pipe into the fitting socket make quite sure that it goes right home against the pipe stop inside the fitting.


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