NFPA CWBSP Exam - Topic 3 Question 26 Discussion

Actual exam question for NFPA's CWBSP exam

Question #: 26
Topic #: 3

For an existing antifreeze system without a backflow prevention device, what size hole is required in the check valve separating the supply and the antifreeze?

A1/32 in. (0.79 mm)

B1/16 in. (1.59 mm)

C1/8 in. (3.17 mm)

D1/4 in. (6.35 mm)

Show Suggested Answer

Suggested Answer: A

If sprinklers are above the level of the water supply to the antifreeze system, a check valve with a 1/32 in. (0.8 mm) hole in the clapper shall be provided in the U-loop.

by Derrick at Mar 08, 2026, 07:39 PM

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