Full port design, used in joining 2 pipes together where a serviceable connection is desired. Acme threads on body and nut eliminate cross threading and prevent nut from creeping under pressure. Rugged Hi-Impact gray PVC Type II construction with EPDM o-ring. Meets ASTM schedule 80 socket standards. Complies with all applicable ASTM and ANSI standards. NSF Listed, IAPMO approved.