Pipework should never be installed in a contaminated environment such as a sewer or cesspool.
Non-metallic (plastic) plumbing fittings are at risk of permeation by diesel or heating fuel, pesticides, insecticides and similar organic substances or fluids, so should never be installed where they could come into direct contact, including contact with soil contaminated with them.
Where this is unavoidable contact the local water undertaker for advice.
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