POLY FLO TUBING/3/8 inch tube outside diameter, wall thickness .062 inch, Color: Red. 66P-R pack of 100Poly-Flo Polyethylene Tubing | 3/8in O.D., RedPoly-Flo tubing is ideal for use in pneumatic lines, pitot and static lines, instrumentation systems, and water lines (as well as limited food service)..