Colder PLC24006 Acetal Tube Fitting, Insert, Straight Thru, In-Line, 1/4" Insert x 3/8" NPT Male Non-valved in-line coupling with for connecting tubes in a straight run Tube insert connection on one end and male NPT threads on the other for connecting two tubes with different ends Acetal plastic body for strength and resistance to solvents and chemicals, with a buna-n seal for resistance to weathering and abrasion Operating temperature range of -40 to +180 degrees F (-40 to +82 degrees C) Pressure range of vacuum to 120 psi (8.3 bar)