What is a deep seal shower trap

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12 Oct 2009
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Clwyd
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United Kingdom
I've been following the interesting discussion about compliance with building regs when connecting a shower trap directly to a soil stack. I haven't seen any reference in the discussions to what exactly is a 'deep seal' trap. When I bought the shower tray, I was sold a McAlpine STW3-R trap as the retailer didn't realise I needed a 'deep seal' trap. I returned it and asked for a deep seal instead and was given a STW4-95. However, I noticed that the depth of the trap was still 95mm. Should I have been given a STW4-R (118mm) instead, as that appears to be a 'resealing' trap, which to me appears to satisfy the regs?
 
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STW3-R = 19mm seal
STW4-95 = 50mm seal
STW4-R = 50mm seal

Min 50mm seal trap for shower if draining to a soil stack.
 
Thanks for the very prompt and informative reply. I am impressed. What a helpful company. I should move down to Essex!
 
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