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The AY MCDONALD 5423-286 is a 1-inch lead-free brass insert adapter designed to transition PEX-A tubing to a female sweat (solder) copper connection. It features a barbed insert end sized for 1-inch PEX-A pipe and a female sweat socket end that accepts standard 1-inch copper tubing for soldering. This fitting is manufactured from lead-free brass to meet current potable water standards. It is used by licensed plumbers working on residential and light commercial water distribution systems where PEX-A expansion tubing meets existing or new copper piping.
This adapter is suited for residential and light commercial plumbing installations where a transition between PEX-A flexible tubing and copper sweat fittings is required. Typical applications include water supply line retrofits, new construction rough-in work, and repairs where a permanent, code-compliant transition joint is needed. The insert end is compatible with 1-inch PEX-A pipe used with expansion-style (ASTM F1960) installation methods.
Designed as an OEM-style transition fitting for 1-inch PEX-A expansion tubing connecting to 1-inch female sweat copper fittings in potable water plumbing systems.
Installation should be performed by a licensed plumber in accordance with local plumbing codes and the IPC. Shut off the water supply and depressurize the line before beginning work. The insert end requires an expansion tool and compatible PEX-A expansion rings per ASTM F1960 procedures; the sweat end must be soldered using lead-free solder in accordance with applicable codes. Do not use this fitting on PEX-B or PEX-C tubing, as the insert geometry is specific to PEX-A expansion applications.
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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