Master Plumber,1/4" ID x 7/16" OD x 50', Black, Non-Reinforced Vacuum Tubing, Small Diameter Thermoplastic Compound For A Variety Of Uses, Designed For Vacuum Applications But Can Be Used For Low Pressure Water Lines, Not For Under Hood, Applications, Non-Reinforced Thermoplastic Compound, Suitable For Use As Windshield Wiper Vacuum Tubing, Weather Resistant, Temperature Range 25 To 150 Degrees Fahrenheit, Working Pressure 40 PSI At 70 Degrees Fahrenheit, Dispenser Box.