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The NIBCO P603 is a 3/4-inch push-to-connect by female threaded adapter fitting designed for use in plumbing supply systems. The push-to-connect inlet allows for tool-free pipe insertion, while the female threaded end mates to standard male-threaded pipe or fittings. This adapter is used to transition between push-connect tubing runs and threaded components in water distribution piping. Licensed plumbers and experienced pipefitters are the primary installers. The fitting is sold individually and is intended for single-use installation in residential and light commercial plumbing applications.
This fitting is suited for use in residential water supply lines and light commercial plumbing systems where a transition between push-to-connect tubing and a female-threaded connection point is required. Typical install scenarios include connecting flexible or rigid tubing to valves, fixtures, or manifold assemblies with male NPT threads. The 3/4-inch size is common in main branch lines and high-flow fixture supply runs.
Designed as an OEM-style push-to-connect adapter for use in residential and light commercial plumbing systems accepting 3/4-inch push-fit connections with a female threaded transition.
Installation should be performed by a licensed plumber in accordance with applicable local plumbing codes and the IPC. Shut off the water supply and depressurize the line before fitting insertion. Ensure pipe ends are cut cleanly and deburred before seating into the push-to-connect inlet. Verify thread engagement on the female end is secure before restoring system pressure.
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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