According to EPA guidelines, the acceptable leak threshold for a product line test is:

• A. .01 gph
• B. .1 gph
• C. .2 gph
• D. 3 gph

Answer: (B)

The key idea is what leak rate is acceptable during a product line test. EPA sets a maximum leakage threshold to decide pass or fail on the line. A limit of 0.1 gallons per hour means the line must not leak faster than that to pass; anything at or below passes, and anything above fails, prompting repairs before certification. This level strikes a balance between detecting real leaks and being practical to measure in the field.

Among the options, 0.1 gph is the threshold that matches EPA guidance. A much smaller value (like 0.01 gph) would be overly stringent, a larger value (0.2 gph or 3 gph) would permit leaks that EPA aims to eliminate.