The Spears Schedule 80 CPVC FKM Union (Socket x Socket) Series 857 fittings are heavy-duty industrial pipe connectors designed for reliable, leak-resistant performance in corrosive, chemical, and high-temperature plumbing systems. Constructed from rugged Schedule 80 CPVC, these unions feature precision-molded bodies and durable FKM O-ring seals that ensure a tight, secure join between socket connections.