Replace Marley kitchen sink waste trap

29 Nov 2015
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United Kingdom
I am trying to replace the waste trap beneath my kitchen sink. The old, broken one is labelled :

Marley Extrusions 11/2 / 40 PP BS3943

I cannot find this brand anywhere.

I showed the old trap to the local plumbing merchants and they sold me a McAlpine trap, saying it should definitely fit. It fits to the sink outlet, but does not fit to the outgoing pipe. The plumbing merchants don't understand why it won't fit.

Can anyone help at all?
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If I remember right the old Marley Push Fit Pipe is slightly smaller than the Solvent Weld and not compatible,

You may need to replace waste pipe or get a universal screw connector and a length of standard waste to fit to the trap.

A picture showing the Waste Trap connection and the pipe will help .
Thanks for that. I have uploaded a photo here.


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Is the fitting on the pipe the original Marley fitting or the new McAlpine fitting,
If its the Marley pull it off and try and fit the pipe to the McAlpine Trap

You may be lucky.
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Yup, pull off that old push fit > compression connector that's from the old trap from the end of that pipe and then fit the new trap.
Last edited:
Cheers guys.

I have had some success now. I pulled off the old push fit, and one of the new traps I bought does fit the outlet. Unfortunately that one doesn't fit the sink outlet. But I am hoping it will simply be a case of swapping it for one with a larger inlet section.

Thanks for your help.

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