Copper Union - Cast - Products
A cast copper union creates a disconnectable joint in a soldered copper line, letting you separate the pipe later to service a valve, pump or appliance without cutting. The three-piece union solders to the copper on each side and joins with a threaded ring nut. Moonshine Bath stocks cast copper unions in common sizes.
Add a union wherever you will want to disconnect later. Each union ships free across the USA, Canada and Mexico, leaves the warehouse within 24 hours on weekday orders before 2 PM EST, and is backed by our price match plus 10 percent beat guarantee.
Frequently Asked Questions
Why install a union in a copper line?
A union provides a clean disconnect point, so you can unscrew the ring nut and separate the pipe to service or replace a component, like a water heater, pump or valve, without cutting and re-soldering.
How do I solder a union without damaging the seat?
Disassemble the union and solder each cup end to the pipe separately, away from the rubber or machined seat, then reassemble once cool. This protects the sealing surface from heat.