Hello. About to replace single bowl kitchen sink with 1.5 bowl, using new pipework. I am assuming usual P trap set up. Are there any rules I need to conform with?
Thanks
Graeme
Only that it must flow downhill, fortunately this isn’t New York state where you can buy a gun but can’t do your own plumbing.
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Have you not heard of the Brooklyn U-Bend Murders? 
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It was a trap.
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Such a waste.
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As in so much in France, just go with the flow
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Straining to see the humour
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Great flush of puns for this one.
it’s panning out quite well so far,
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Oh that’s it, now down the toilet
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That’s fine if room is no problem, but to gain more space I use waterless traps mounted horizontally.
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As can be usual, cross threading occurs so easily and the original intent of the post goes down the drain.
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All these puns are driving me round the bend
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Pipe down, we’re busy plumbing the depths…
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I think you’ve got the drop on him.
..why can’t folk stay with the flow of things in this forum?…everyone wants to be the font of all knowledge! 
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Try not to sink to their level 
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It’s best to just plunge in.
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It’s great how we pool our knowledge.