Master plumber, 1/8" id x 5/16" od x 50', black, non-reinforced vacuum tubing, small diameter thermoplastic compound for a variety of uses, designed for vacuum applications & can be used for low pressure water lines, not for under hood, applications, non-reinforced thermoplastic compound, for use as windshield wiper vacuum tubing, weather resistant, not for under hood, application, temperature range 25 to 150 degrees fahrenheit, working pressure 60 psi at 70 degrees fahrenheit.