Bottle trap wont seal at basin level

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29 Apr 2020
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Hi all, have a little problem with installing a new bottle trap as the old one was leaking all over the place. Right now i'm having an issue with the telescopic pipe sealing at the top end with the washer and nut tightened as far as it will go (about 2 threads) and the pipe has a lot of play even with all that done. Kind of stumped on what to do. My sink is a circular glass one. Took a picture of the problem area

qhgKJtX.jpg


Thanks
 
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I think your wastes thread ,and your traps thread are not compatible. Did you source the waste and trap from different sources ?
 
Waste came with the sink back in the day so yes, i've tried two kits so far, floplast and now the alpine and both have issues with sealing at the top.

For reference on the old vs new
MpIqVpK.jpg
 
Last edited:
I think your waste is a European thread , metric probably. UK traps are BSP ( British imperial threads). Change the waste fitting for a UK waste. Or search for a conversion coupler to go in between.
Can you show a pic of the waste thread ,without the trap connected ?
 
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Your trap slides inside the outlet, your rubber seal and nut sit on the outlet to receive the trap ,should be straight forward.
 
I think your waste is a European thread , metric probably. UK traps are BSP ( British imperial threads). Change the waste fitting for a UK waste. Or search for a conversion coupler to go in between.
Can you show a pic of the waste thread ,without the trap connected ?

As you can see it's a lot of thread but i can get about 2-3 turns and it'll tighten up.

Am i looking for something like this then? https://www.screwfix.com/p/mcalpine-t12a-f-1-bsp-eu-uk-coupler-white-40mm-x-40mm/1358v
58EAzq8.jpg
 
Macalpine S12A - F ,is for basin waste conversions...but it's white plastic !!
Internet search will likely turn up , a chrome version.
 

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