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The NIBCO M001260 is a 3/4-inch CPVC transition coupling designed to connect IPS (Iron Pipe Size) and CTS (Copper Tube Size) pipe systems using slip-style end connections. This fitting bridges two common pipe sizing standards in a single unit, eliminating the need for additional adapters at the joint. Constructed from CPVC, it is suited for hot and cold water distribution lines where chemical resistance and durability are priorities. Plumbers and pipefitters install this coupling during new construction, remodel, or repair work where CPVC piping transitions between IPS and CTS dimensions.
This transition coupling is used in residential and light commercial plumbing systems where CPVC supply lines meet copper tube or IPS-dimensioned pipe. Typical applications include service connections, fixture supply lines, and water distribution runs where a direct slip-to-slip joint is required between the two sizing standards. The single-piece design keeps the transition compact and within the existing pipe run without additional fittings.
Designed as an OEM-style replacement or new-installation fitting for 3/4-inch CPVC plumbing systems requiring a transition between Slip IPS and Slip CTS pipe connections.
Installation is performed by a licensed plumber following applicable IPC or local plumbing code requirements. Shut off the water supply and relieve system pressure before cutting into any existing line. Both mating pipe ends should be cut square, deburred, and cleaned before applying CPVC-rated solvent cement to both the pipe and fitting socket. Allow full cure time per the cement manufacturer's instructions before restoring water pressure.
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