Hi all, first time posting anything, but long time reader, these forums have helped me loads when doing bits and pieces in our complete cottage refurb! I have an existing wet room floor (using a pre formed kit), however the drainage is poor. It's due to the existing 'unusual' waste routing, installed before we bought the property, which can't be changed now, unfortunately - there is very little run, and it has to run horizontally for approx 15m before it gets to the stack!!!! My shower trap is in the usual 1 1/2 waste, but I'm looking at fitting a Whale Gulper pump to assist with the drainage. This pump has a 15mm waste inlet, and a 22mm outlet. I was hoping not to replace my trap, and was thinking about hopefully using some sort of reducers to bring my existing 40mm waste down to the 15mm pump inlet. Has anyone had any experience of this, or am I onto plums and need to replace the trap? Fingers crossed it can be done, thanks in advance for any replies Davy.