Colder PLCD42004 Acetal Tube Fitting, Insert, Shutoff, Panel Mount, 1/4" Insert x 1/4"Barb Valved bulkhead fitting for connecting two tubes through a panel Barbed connection on one end and push-in connection on the other for connecting two tubes 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)