Hi I am about to install a replacement Bath and Wash hand basin and an additional shower but only have one 1" 1/2 drainage pipe that I can use.
If I fit anti vac traps to bath/whb/shower can I connect all three into the same 1" 1/2 pipe without too many issues?
The run will be no more than 3m.
Access to the soil pipe to attach additional 32mm/40mm pipes is almost imposssible without cutting into the stud wall and then drylining / replastering
Many Thanks for any advice