Drainage, Waste & VentQuestion 6 of 120
A horizontal building drain changes direction with a fitting that turns the flow 90 degrees. What does the code require at that point?
a.A backwater valve
b.A relief vent
c.A cleanout
d.An indirect waste receptor
Explanation
A cleanout is required at each change of direction of the building drain or horizontal waste line that exceeds 45 degrees, because a 90 degree turn is the point most likely to trap a stoppage. A backwater valve protects against sewer backflow, a relief vent relieves pressure in a stack, and an indirect waste receptor handles unconnected discharge, so none of them satisfies the access requirement.
Law Reference: UPC §708.1Practice all 120 questions free — no signup required.
Related questions on this topic
- Except for traps specifically designed as deep seal traps, what is the required liquid seal depth of a fixture trap?
- A 4 in building drain runs 96 ft from the last fixture connection to the point where it leaves the structure. Installed at the code minimum slope for its size, what is the total fall?
- A fixture drain serving a lavatory is 1-1/2 in in diameter. What is the smallest vent size that may serve it?
- A 2 in trap arm serves a floor-mounted fixture. The trap weir is at elevation 0. What is the greatest amount the trap arm may fall before it reaches the vent connection?
- Which trap arrangement is expressly prohibited because it will siphon its own seal?
- A 3 in horizontal drain is run 72 ft at 1/8 in per ft. The invert at the upstream end is at elevation 100.00 ft. What is the invert elevation at the downstream end?
Last reviewed: · editorial process
PrepPass Editorial Team · Verified against Journeyman Plumber Licensing Exam (UPC/IPC-based) · How we review