The Anvil 8700163051 is a 1" Class 150 malleable iron ground joint pipe union with a black steel finish. Ground joint unions let two threaded pipe ends be joined and later separated without unscrewing back through the entire run -- essential for serviceable connections, replacement fittings, and any installation where future disassembly is expected.

• Trade size: 1"
• Finish: Black Steel
• Class 150 pressure rating
• Female NPT threads on both ends
• Three-piece ground joint design: nut, tail piece, and union body
• Conforms to ASME B16.39 (malleable iron threaded pipe unions)
• Complies with AAR Manual of Standards and Recommended Practices
• Domestic steel construction

Tip: 1" lines fit gas mains in single-family runs, compressed air drops, and small boiler returns. Hand-tighten the union nut, then give it a final wrench turn until the ground joint seats firmly -- over-tightening scores the seat and creates weep leaks. Use pipe dope or PTFE tape on the male NPT threads only, never on the union's ground joint seat.