100% pressure tested. Rated at maximum 300 psi at 150°F or 150 psi at 300°F. For use with residential potable drinking water applications. Galvanizing on fittings done by hot dip process, according to ASTM A153. Galvanized fittings are certified to NSF 61 and the lead free law. UL and FM listed. Not for underground use. Galvanized. Size 3/8”.