Maine Propane Tank Setter Practice Test

Should you use pipe thread-sealing compounds on the seats of brass flare fittings?

Yes No Only on the seats Only with copper fittings

Correct Answer:

Explanation:

The essential idea is that flare fittings seal with their flare seating surfaces, not with the threads. The nut tightens the flare to create a metal-to-metal seal, so applying pipe-thread sealant to the seating area would contaminate the surfaces and prevent proper sealing. For propane installations, no sealant belongs on the seats of brass flare fittings; assemble to spec and verify with a leak test.

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