dobbslc
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- 12,322
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- Hertfordshire UK
The seal for the waste kit should be flat and sit agaisnt the bottom of the thread not inside. That washer looks to be for the outlet into the 32mm pipe (compression ).
Learnt my lesson using there cheap fittings myself
It is flat but as soon as I tightened the damm thing up it got pushed into the inside of the chrome waste! POS!