Sioux Chief 643WG2 1/2" MSWT x F1960 PEX No-Lead Brass Adapter

Sioux Chief 643WG2 1/2" MSWT x F1960 PEX No-Lead Brass Adapter

The Sioux Chief 643WG2 is a 1/2" MSWT x 1/2" F1960 no-lead brass adapter built for rough-in plumbers who need to transition a male sweat (solder) copper connection to PEX tubing without giving up flow. One end is sized to solder onto 1/2" copper pipe; the other end uses the F1960 expansion connection method to accept 1/2" PEX tubing. The entire fitting is machined from a single piece of no-lead brass, so there are no secondary seams or press-fit joints working against the connection over time. Because the waterway carries no internal restriction, this adapter passes full flow straight through the transition point instead of choking it down the way many reduced-bore fittings do, which matters on runs where water pressure is already tight.

Key Features

• Trade Size: 1/2" MSWT x 1/2" F1960, matched for a direct 1/2" copper-to-PEX transition with no bushings or reducers required.
• One-Piece No-Lead Brass Construction: the body is machined from a single piece of no-lead brass, eliminating the seams and secondary joints that can become future leak points in a wall or slab.
• Full-Flow Waterway: the bore runs with no internal restriction, so water volume and pressure carry through the fitting instead of being choked down at the transition.
• Male Sweat (MSWT) Connection: one end solders directly onto 1/2" copper pipe using a standard sweat joint, so it drops into an existing copper rough-in with ordinary solder technique.
• F1960 PEX Expansion Connection: the opposite end mates with 1/2" PEX tubing using the F1960 expansion method rather than a crimp ring or cinch clamp, which keeps the transition compatible with expansion-style PEX systems.
• No-Lead Brass Alloy: the brass formulation is no-lead, a material choice that matters for any fitting installed on a potable water line.

Certifications & Compliance

• No-Lead Brass Construction
• F1960 PEX Expansion Connection Method

Technical Specifications

• Trade Size: 1/2" MSWT x 1/2" F1960
• Material: One-Piece No-Lead Brass
• Country of Origin: United States
• Packaging: 100 EA per carton

Typical Applications

• Copper-to-PEX Transition Fittings in Rough-In Plumbing
• Residential and Commercial Water Supply Line Installations
• New Construction and Remodel Plumbing Runs
• Potable Water Rough-In Connections Between Copper and PEX
• Panel-Ready Stub-Outs Where Copper Sweat Meets a PEX Distribution System

Why Sioux Chief?

Sioux Chief backs the 643WG2 adapter with one-piece no-lead brass construction and a full-flow bore that avoids the pressure loss common with reduced-bore transition fittings. Because the fitting is machined rather than assembled from multiple parts, plumbers get a single, solid connection point at the copper-to-PEX transition instead of an extra joint to solder, crimp, and inspect. For crews bridging copper sweat and F1960 PEX systems on the rough-in, this fitting offers a dependable, single-piece brass build made in the United States for professional water-supply installations.