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The Mueller US4-4 is a brass swivel union connector designed for efficient fluid transfer. This component connects two flare fittings with a size of one-quarter inch. The lightweight nature of this connector makes it suitable for various applications in hydronics and pneumatics.
The US4-4 swivel connector is ideal for professionals in plumbing and HVAC. It is designed for easy installation and reliable connections.
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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