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@hippy
40mm Double Nozzle Washing Machine Utility P Trap
Adjustable inlet
WRAS Approved Product
Approved UKAS Quality Management
BBA approved
BSI Registered
IPHE Industrial Associate
Conformed to BS EN ISO9001:2000
BS EN 12056-2: 2000 requires that traps discharge to a soil stack have a 75mm seal. However other water seal depths can be installed:-
50mm Water Seal - can be fitted to baths, shower trays and basins with spray taps and no plugs.
38mm Water Seal - can be used on ground floor's when connecting to flat bottomed appliances that discharge to a back inlet gully.
All traps have a 75mm Water Seal unless an alternative is stated.
http://www.tradingdepot.co.uk/DEF/product/!!HUNPWM040D!!/D007007002/Plumbing%20Supplies%20&%20Heating%20Supplies/Waste%20and%20accessories/Wastes%20and%20Traps/Traps/40mm%20Double%20Nozzle%20Washing%20Machine%20Utility%20P%20Trap
Is it the water seal bit that specifies the height?