Photo 1 of PATIKIL 3/8 SAE Male x 5/8 SAE Male Brass Tube Coupler, 2 Pack Pipe Fitting Thread Gas Adapter Flare Connector Union Coupling with PTFE Tape for HVAC Fuel Oil Air Gas Line Connection

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Photo 1 of PATIKIL 3/8 SAE Male x 5/8 SAE Male Brass Tube Coupler, 2 Pack Pipe Fitting Thread Gas Adapter Flare Connector Union Coupling with PTFE Tape for HVAC Fuel Oil Air Gas Line ConnectionPhoto 2 of PATIKIL 3/8 SAE Male x 5/8 SAE Male Brass Tube Coupler, 2 Pack Pipe Fitting Thread Gas Adapter Flare Connector Union Coupling with PTFE Tape for HVAC Fuel Oil Air Gas Line Connection