I'm fitting a McAlpine Bidet Trap and have discovered in their booklet that because it's a 19mm water trap it must NOT be connected into a Soil Pipe. My only conclusion is that this may be due to suction and possible risk of emptying of the trap when the pan is flushed, if it can't be connected to the 110mm soil then where to ? The original pan, basin and bidet were connected into the soil pipe.
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