Colder PMCD1604 Acetal Tube Fitting, Coupler, Shutoff, Panel Mount, 1/8" Flow Coupler x 1/4" Barb Panel mount coupling mounts to a wall or panel to connect tubing to coupling through a barrier Fitting connects to tubing on one end and has a Colder PMC series 1/8 flow female coupling on the other Acetal copolymer plastic has low moisture absorption, high tensile and flexural strength, and resistance to fatigue Barbed fitting creates a tight seal on flexible and semi-rigid tubing when used with a hose clamp or crimp sleeve or ferrule (sold separately) Shutoff valve helps prevent fluid spills