Drainage, Waste & VentQuestion 163 of 360
Two fixtures set on the same floor level and connecting to a common vertical drain within the required distance may share…
a.a single trap for both
b.one backwater valve
c.a common vent, provided the drain and vent are sized for both fixtures
d.one cleanout only
Explanation
Two fixtures at the same level connecting to a shared vertical drain within the code distance may be served by a common vent, with the connecting drain and vent sized for the combined load. Each fixture still has its own trap; a single trap serving two fixtures is generally prohibited. Common venting saves piping for back-to-back layouts.
Practice all 360 questions free — no signup required.
Related questions on this topic
- An indirect-waste standpipe receiving a domestic clothes washer must have a trap, and the standpipe height above the trap weir must generally be within what range?
- What distinguishes an 'air break' from an 'air gap' in an indirect waste installation?
- A combination waste-and-vent system is chiefly intended for…
- As a vent extends upward toward its terminal, its required diameter…
- Where a building (house) trap is installed on the building drain, it is commonly accompanied by…
- In a horizontal wet-vent system, how must the wet-vented pipe (which carries both waste and air) be sized?
Last reviewed: · editorial process
PrepPass Editorial Team · Verified against California CSLB C-36 Plumbing Trade Examination · How we review