Flow rate 34 litres/minute when tested under a constant 120 Millimetre head of water in accordance with clause 5 of BS EN 274-2:2002. Looking on Youtube some seem to just cut out a oversize large square hole with a smaller pipe slot coming off, whilst others seem to use a whole saw to cut out a round hole a little bigger than the trap itself + pipe slot. I can see the larger hole might be easier although it then lends less support to the base of the tray around the drain hole which is the thinnest and weakest point of the tray. A round hole that's tighter lends more support but makes fitting harder. Even then some seem to cut larger round holes than others!!! For Product codes ST90CP10-70, ST90CB10-70, ST90WH10-70: additional longer flange code is: STW9030WSTBDY-43MM

For Product codes ST90CP10-70, ST90CB10-70, ST90WH10-70: additional longer flange code is: STW9030WSTBDY-43MM. I chose it based on the fact the internals completely disassemble for cleaning. Our existing trap doesn't, just has a removable basket and is a total pain to clean when required once or twice a month. Another option would be to use another 135 degree bend to return the pipe to straight. Is it within spec to do this or must the bend remain for any reason? Flow rate 34 l/min when tested under a constant 15mm head of water in accordance with clause 5 of BS EN 274-2:2002 Probably not that relevant to your original question, but I have a tip that can help with the difficulty of lining up the trap if you have to fit the trap and pipework prior to laying a base and then shower tray on top.

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x 50mm Water Seal Shower Trap with 2" Universal Outlet High-Flow High-Performance Trap with removable 110mm Flange. Flow rate 42 l/min when tested under a constant 15mm head of water in accordance with clause 5 of BS EN 274-2:2002 x 50mm Water Seal Shower Trap with 1½" Outlet High-Flow High-Performance Trap with removable 110mm Flange If it makes any difference, I have no access from below so the trap can't be pre-fitted to the tray - it will have to be fitted to the pipework and then joined onto the tray after the tray is in situ.

Flow rate 50 l/min when tested under a constant 15mm head of water in accordance with clause 5 of BS EN 274-2:2002 However I'm a bit confused by the 1.5"'multi adapter' that comes with it. It creates a bend (I think 135 degrees) in the pipe which can be rotated to face any direction. I had assumed I could discard this and pipe straight into the compression fitting on the side of the trap, however I don't think this is possible as the internal diameter of this fitting is 39-40mm which won't accept the 40mm solvent weld pipe I am using (OD circa 43mm) Ideally I don't want to introduce a bend as my pipe run needs to be straight. Is there some sort of adapter I can buy to fit solvent weld straight into the compression fitting on the side of the trap? Ideally it needs a collar on it so the nut can pull it in tight.