If you have only a slight fall on your waste pipes. you could insert a inch and a half Mcalpine non return waste valve, to combat waste water from bath being forced up into shower tray. they are available from plumbers merchants or even B and Q and Wickes. Hope This Helps, Smithy
Hi Marco, Fittings are available from G,C, White Builders and Plumbers merchants, Loughton, *******. i'am affraid i dont have the phone number, as i moved from the area 5 years ago. Good Luck, Smithy.
