Drainage, Waste & VentQuestion 67 of 360
What is the minimum clearance required in front of a cleanout on a 4 inch drainage pipe?
a.12 inches
b.24 inches
c.18 inches
d.30 inches
Explanation
Cleanouts on pipe 3 inches and larger require a minimum clearance of 18 inches in front of the cleanout for rodding. Cleanouts on pipe smaller than 3 inches require only 12 inches. The 24 and 30 inch figures are more than the code minimum.
Law Reference: 2022 California Plumbing Code (CPC) §707.9Practice all 360 questions free — no signup required.
Related questions on this topic
- For a 1-1/2 inch trap arm, the maximum developed length from the trap weir to the vent is:
- Cleanouts in horizontal drainage lines must be spaced no more than:
- The minimum diameter of a vent pipe must be:
- A 4 inch building drain sloped at 1/4 inch per foot is permitted a maximum load of how many drainage fixture units (DFU)?
- A 3 inch building sewer sloped at 1/8 inch per foot is limited to a maximum of how many DFU?
- What is the maximum DFU load on a 2 inch horizontal fixture branch?
Last reviewed: · editorial process
PrepPass Editorial Team · Verified against California CSLB C-36 Plumbing Trade Examination · How we review