Kitchen waste trap to plughole. All aspects of plumbing questions and answers, help, tips and information

[Gary B]

Hi all.
I am in the middle of doing my kitchen, and when i went to fit the sink i discovered that the waste fitting under the sink, internal measurment was 39mm, and the trap fitting external measurment was 40mm. I thought it was all standard sizes. Can someone please advise.

ATB Gary.

[stoneyboy]

Gary B,
Assuming you are saying that the trap flange will not fit into the waste either file or trim the waste so it does fit or go and buy a new waste of the right size. Do not try reducing the size of the trap flange.
end

[Gary B]

Thanks for your reply stoneyboy, and sorry for delay in my reply.

There was in fact an adaptor in a bag which came with the sink. (Which the wife just hapened to put aside).

Thanks again for your time.
ATB Gary.