I HAVE to connect a bath waste and a shower waste to at least 6 inches of commoned 38mm pipe..now I have done this before, and occasionally one of the traps gets sucked dry...by the other emptying..
I've got a Durgo right at the top of the stack these two will feed into, but I am wondering whether there is a miniature one I could pop onto a short length of vertical pipe to reduce vacuum.on the 38mm branch...the bath is about 3 feet from the stack, but the shower has to run past it about 10 feet or more...
Or am I being too fussy?