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The JOHN GUEST PEI063628-US is a PEX reducer fitting designed for use in residential and light commercial plumbing systems. Reducer fittings connect two pipes of different diameters in a single inline transition, maintaining flow continuity without additional adapters. This fitting carries a 1-inch size designation and is constructed for use with PEX tubing, making it suitable for potable water distribution, radiant heating loops, and general hydronic piping. Licensed plumbers and pipefitters install this type of fitting as part of branch reductions and main-to-lateral transitions throughout a piping system.
This reducer is intended for PEX piping applications in residential and light commercial settings. It is well suited for new construction plumbing rough-ins and retrofit projects where a pipe diameter transition is needed within a PEX run. No specific compatible model numbers or system families were provided in the product data, but the fitting is appropriate for standard PEX plumbing assemblies requiring a reduction at the 1-inch connection point.
Designed as an OEM-style replacement fitting for standard 1-inch PEX plumbing systems in residential and light commercial applications.
Installation should be performed by a licensed plumber in accordance with the International Plumbing Code and all applicable local codes. Shut off the water supply and relieve system pressure before cutting into any existing line or removing fittings. Ensure the PEX tubing ends are cut cleanly and squarely before seating them into the fitting. Do not exceed the pressure and temperature ratings specified on the fitting or packaging.
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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