Crack resistant, low-density polyethylene material. Made from non-toxic ingredients to FDA Standards. Listed by NSF. Brittle at -76° Fahrenheit, 125° operating temperatures max. Safe for drinking water lines; leaves no taste or odor. 70 to 125 PSI at 70° Fahrenheit. Do not use where temperatures are below 35° Fahrenheit or above 100° . Milky white color.