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?

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?
A . 1/32 in. (0.79 mm)
B . 1/16 in. (1.59 mm)
C . 1/8 in. (3.17 mm)
D . 1/4 in. (6.35 mm)

View Answer

Answer: A

Explanation:

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.