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The MERIT BRASS MB22520 is a lead-free press-by-male-iron-pipe (MIP) adapter designed for transitioning from a press-fit copper system to a threaded male connection. At 3 inches, this fitting suits larger-diameter residential and light commercial plumbing applications. The lead-free construction meets regulatory requirements for potable water systems. Licensed plumbers and pipefitters install this fitting where a press-fit line must terminate or connect to a threaded valve, manifold, or fixture with a male NPT end. No open flame is required at the press joint, making it suitable for installations where torch work is restricted or impractical.
This adapter is used in commercial and residential potable water systems, hydronic heating piping, and recirculation lines where 3-inch press copper pipe terminates at a threaded component. It is well suited for mechanical rooms, boiler rooms, and large-diameter distribution lines where threaded transitions are required. The press end eliminates soldering time and reduces labor on larger-diameter connections where torch work is more demanding.
Designed as an OEM-style replacement or new-installation fitting for 3-inch press copper piping systems with standard male NPT threaded terminations.
Installation should be performed by a licensed plumber in accordance with applicable IPC and local plumbing code requirements. Shut off and depressurize the water supply before fitting installation. The press end requires a compatible press tool and the correct jaw size for 3-inch fittings — verify tool and jaw compatibility with the press fitting system in use before pressing. Do not overtighten the MIP threaded end; use appropriate thread sealant or tape rated for potable water.
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