Colder PMC2004 Acetal Tube Fitting, Insert, Straight Thru, In-Line, Ferruleless, PTF, 1/8" Insert x 1/4" Tube OD Insert has one or more ribs for creating a tight seal and connects tubing in a straight run Fitting connects to tubing on one end and has an insert connector on the other Acetal copolymer plastic for low moisture absorption and high tensile and flexural strength Working pressure of up to 120 psi Operating temperatures range from -40 to 180 degrees F