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Do you need to use teflon tape when making a metal on metal tube connection?
metal tube connections
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It depends on the type of fitting. Metal to metal like CGA to tank, no, the seal is a compression seal on the washer. NPT threads, yes as the threads are prone to leaking. Flare fittings, no, the flare compression does the seal.
The material is not as important as the design of the seal.
The material is not as important as the design of the seal.
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