Crack resistant, low-density polyethylene material Made from non-toxic ingredients to FDA Standards Listed by NSF Brittle at -76 degrees Fahrenheit, 125 degrees operating temperatures max Safe for drinking water lines; leaves no taste or odor 70 to 125 PSI at 70 degrees Fahrenheit Do not use where temperatures are below 35 degrees Fahrenheit or above 100 degrees Milky white color O.D. x I.D. Ins.=5/16 x 3/16 Lgth Ft=300