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The MUELLER STREAMLINE FTG00848 is a straight wrot copper reducer fitting used to connect two different-diameter copper pipe runs in a single inline solder joint. It measures 3.5 inches in length and transitions from a 2.12-inch female solder (FTG) end to a 1.38-inch male solder (C) end. Wrot copper construction provides reliable pressure ratings and corrosion resistance suited for potable water, hydronic heating, and mechanical piping systems. Licensed plumbers and pipefitters install this fitting during new construction or retrofit work wherever a straight-run pipe reduction is required without an offset or change in direction.
This reducer fitting is used in residential and light commercial plumbing, hydronic radiant, and HVAC refrigerant piping applications where two copper pipe sizes must be joined inline. The FTG (fitting-to-copper) socket end accepts a copper pipe or fitting spigot, while the male solder end inserts directly into a standard copper fitting socket. It is a common choice when transitioning supply lines, branch feeds, or mechanical room headers down to a smaller pipe diameter.
Designed as an OEM-style replacement or new-installation fitting for copper piping systems using standard 2.12-inch FTG and 1.38-inch C end connections joined by solder.
Installation should be performed by a licensed plumber in accordance with applicable IPC or local plumbing code requirements. Shut off and depressurize the water or fluid system and allow all pipe sections to cool completely before cutting or fitting. Clean and flux all mating surfaces before applying heat; use only lead-free solder alloys where required by code for potable water systems. Avoid overheating the fitting, as excessive heat can damage the copper and result in a failed joint.
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