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The SIOUX CHIEF 641wg433 is a brass F1960 PEX tee fitting designed for cold- and hot-water distribution in residential and light commercial plumbing systems. Sized at 1 inch by 3/4 inch by 3/4 inch, this reducing tee allows a branch takeoff from a 1-inch main run down to 3/4-inch lines on both the branch and the outlet. The F1960 designation means it is engineered for cold-expansion PEX connections, which require an expansion tool and PEX ring to create a leak-tight joint. Brass construction provides durability and corrosion resistance suited to potable water applications. Licensed plumbers and pipefitters are the primary installers.
This fitting is used in PEX-a piping systems that conform to ASTM F1960 standards. Typical applications include trunk-and-branch or home-run manifold distributions in residential new construction and remodel work. The reducing configuration makes it useful for stepping down from a main supply line to smaller branch circuits serving individual fixtures or zones.
Designed as an OEM-style replacement or new-installation fitting for ASTM F1960 cold-expansion PEX-a plumbing systems.
Installation requires a calibrated F1960 PEX expansion tool and the appropriate PEX expansion rings sized to each port. Shut off the water supply and depressurize the line before cutting or joining pipe. Work must comply with applicable local plumbing codes and the International Plumbing Code where adopted. Allow expanded connections to recover fully before pressurizing the system.
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