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NFPA CWBSP Exam - Topic 3 Question 26 Discussion

Actual exam question for NFPA's CWBSP exam
Question #: 26
Topic #: 3
[All CWBSP Questions]

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?

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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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Brynn
15 days ago
Wait, are we sure about these sizes?
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Frank
20 days ago
I thought it was 1/8 in. (3.17 mm).
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Gretchen
26 days ago
It's definitely 1/16 in. (1.59 mm).
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Lisha
1 month ago
Why is there no backflow prevention device? Seems risky!
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Martin
1 month ago
Totally agree with Rebecka!
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Shenika
1 month ago
Wait, are we sure about these sizes?
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Carlton
2 months ago
I thought it was 1/8 in. (3.17 mm).
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Rebecka
2 months ago
It's definitely 1/16 in. (1.59 mm).
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Camellia
2 months ago
I have a feeling that 1/4 in. is too large for a check valve in an antifreeze system, but I can't recall the exact reasoning behind it.
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Ezekiel
2 months ago
I practiced a similar question, and I recall that 1/32 in. was mentioned as a possible option, but I can't remember if it was for this specific scenario.
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Stephanie
2 months ago
I'm not entirely sure, but I feel like 1/16 in. could be the right answer since it's smaller and might prevent backflow better.
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Evangelina
2 months ago
I think the hole size might be 1/8 in. because I remember it being a common size for check valves.
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