Michael Mcneil wrote:

"newman" wrote in message


I have had to renew my sink waste in 40mm plastic pipe. What is the best
method of sealing this to an external 3in cast iron pipe? At the moment
the plastic is pushed about 300mm into the cast iron pipe which runs at
a 20 degree fall.

What is the problem?

Presumably you have a trap below the sink to stop odours coming up the
spout?

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Yes, but I want to stop insects etc getting into the pipe and smells
coming back up, as the pipe is beside my patio.

Regards