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.