Sioux Chief 644WG No-Lead Bras...
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Sioux Chief 644WG No-Lead Brass FSWT x F1960 PEX Adapter

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Model: 644WG23

In Stock (leaves warehouse same day if ordered before 3pm ET)

$16.01
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Sioux Chief 644WG No-Lead Brass FSWT x F1960 PEX Adapter

The Sioux Chief 644WG is a one-piece no-lead brass transition fitting built for rough-in plumbers who need a reliable bridge between copper sweat supply lines and PEX expansion tubing. This family is available in two connection-size pairings — 1/2" FSWT x 3/4" F1960 and 3/4" FSWT x 1/2" F1960 — so plumbers can select the exact copper-to-PEX transition required on the job. One end of every size is machined as a female sweat (FSWT) connection for soldering directly onto copper pipe, while the opposite end is an F1960 expansion fitting designed to accept PEX tubing using the F1960 expansion method. Each size is cast as a single piece of no-lead brass, eliminating the need for a secondary union or coupling at the transition point. The fitting is engineered for full flow with no internal restriction, so pressure loss through the waterway is minimized compared to designs that neck down the passage. Because it is a no-lead brass part, the 644WG family is intended for potable water supply applications where lead-free fittings are required by code.

Key Features

  • Connection Sizing: available in 1/2" FSWT x 3/4" F1960 and 3/4" FSWT x 1/2" F1960 configurations for copper-to-PEX transitions.
  • One-Piece No-Lead Brass Construction: a single machined brass body eliminates extra joints and reduces potential leak points at the transition.
  • Full Flow Design: the waterway is sized with no restriction, maintaining flow rate through the fitting across both size options.
  • Sweat Connection: the FSWT end solders directly onto copper pipe for a standard sweat joint.
  • F1960 Expansion End: the opposite end is configured for the F1960 PEX expansion connection method, used with a PEX expansion tool and compatible expansion rings.
  • No-Lead Compliant: manufactured to no-lead brass specifications for potable water rough-in work.

Technical Specifications

  • Connection Sizes: 1/2" FSWT x 3/4" F1960 or 3/4" FSWT x 1/2" F1960
  • Material: One-Piece No-Lead Brass
  • Connection Type: Female Sweat x F1960 Expansion
  • Country of Origin: United States
  • Packaging: 50 EA per carton

Typical Applications

  • Transitioning copper supply lines to PEX distribution tubing
  • Residential and commercial rough-in plumbing
  • Repiping projects converting copper branches to PEX
  • New construction water supply rough-in
  • Renovation work requiring copper-to-PEX adapters

Why Sioux Chief?

Sioux Chief manufactures this adapter family as a one-piece no-lead brass fitting with a full-flow waterway, giving plumbers a dependable, code-focused transition between copper and PEX systems without sacrificing flow or adding unnecessary joints. Whether the job calls for the 1/2" FSWT x 3/4" F1960 or the 3/4" FSWT x 1/2" F1960 configuration, the no-lead brass construction supports potable water rough-in requirements, and the single-piece design simplifies installation at the sweat-to-PEX transition point for both residential and commercial plumbing crews.

Manufacturer Resources

Spec Sheet

Product Specs

Country of Origin:
United States
Product Subgroup:
Fittings and Valves
Product Type:
PEX Transition Adapter
Product Material:
No-Lead Brass
Product Group:
Rough-In and Supports
Department:
Plumbing
Connection Type:
Female Sweat x F1960 Expansion
Product Size:
1/2" - 3/4"

Sioux Chief 644WG23 – Frequently Asked Questions

1) Does the Sioux Chief 644WG adapter let me go from copper sweat pipe straight to PEX without a coupling?
That's exactly what it's for. The 644WG is a one-piece no-lead brass body with a female sweat (FSWT) end on one side and an F1960 PEX expansion end on the other, so you solder one side to copper and expand PEX onto the other. No union or coupling is needed at the transition, which removes a joint and a potential leak point.
2) Which size combinations does the Sioux Chief 644WG copper-to-PEX adapter come in?
Two: 1/2 inch FSWT x 3/4 inch F1960 (model 644WG23) and 3/4 inch FSWT x 1/2 inch F1960 (model 644WG32). Note the sweat size and the PEX size are reversed between them, so check which side of your transition is the larger pipe before ordering. If you are sweating onto 3/4 inch copper and running 1/2 inch PEX branches, you want the 644WG32.
3) Is the Sioux Chief 644WG adapter safe for potable water lines?
Yes. The body is no-lead brass, manufactured to no-lead brass specifications for potable water rough-in, which is what matters on domestic water supply in both residential and commercial work.
4) Does soldering this adapter risk damaging the PEX end?
The sweat side is a female socket that solders onto copper pipe as a standard sweat joint, so standard practice applies: make the solder joint before you expand PEX onto the other end, and keep the heat on the sweat socket. Because the fitting is a single machined brass body, there is no internal seal or O-ring at the transition to cook.
5) Can I use this brass adapter to convert existing copper branches to PEX during a renovation?
Yes, that is one of its stated uses. For repipes you cut back to sound copper, sweat the FSWT end onto the existing stub, and run F1960 PEX from there. It is listed for residential and commercial rough-in, repiping copper branches to PEX, new construction supply rough-in, and renovation copper-to-PEX work.
6) Does the 644WG restrict flow where copper meets PEX?
The waterway is full flow with no internal necking down, so pressure loss through the fitting is minimal compared with adapters that reduce the bore at the transition. The trade sizes themselves still step between 1/2 and 3/4 inch depending on which model you pick.
7) How is the Sioux Chief 644WG adapter packaged for a repipe job, and where is it made?
It ships 50 each per carton, which suits repipe and new-construction rough-in where you are setting many transitions. Country of origin is the United States.
How fast can I get the Sioux Chief 644WG23 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Sioux Chief 644WG23 come with a warranty?
Absolutely. The Sioux Chief 644WG23 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Sioux Chief 644WG23?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Sioux Chief 644WG23 from ZenSupply?
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