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The Mueller U4-4 is a brass flare female to female union designed for fluid connection in hydronics and pneumatics systems. This union features a quarter inch flare fitting that ensures leak-free integration for a variety of applications.
This product is essential for connecting tubing in HVAC and plumbing systems.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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