1-1/2in Lead Free Brass Female NPT Threaded Union Connection Pipe
Note the thread size: flare connector threads are UNF threads, which are straight threads, not taper NPT threads.flare thread size is a Nominal Pipe
Brass Tube Flare Fittings,Union Connector Gas Adapter, Brass Tube Coupler 3/8 inch Male Flare to 3/8 inch Female NPT 2 Pack
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1/8 Female NPT x 1/2 Female NPT Brass Pipe Adapter Coupling
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Proline Series 3/8-in x 1/4-in Threaded Union Fitting in the Brass
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1/2' Female NPT X 3/8' Male Flare Brass Union 45° Fler Both Ends