Sioux Chief 644WG4 1" No-Lead ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$14.81
Sioux Chief 644WG4 1" No-Lead Brass FTG x PEX Adapter Fitting

Sioux Chief 644WG4 1" No-Lead Brass FTG x PEX Adapter Fitting

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Model: 644WG4

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

$14.81
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Sioux Chief 644WG4 1" No-Lead Brass FTG x PEX Adapter Fitting

The Sioux Chief 644WG4 is a 1" one-piece no-lead brass transition fitting built for rough-in plumbers moving between a sweat-soldered copper connection and a PEX distribution run. One end is configured as a female sweat (FSWT) fitting (FTG) sized for 1" copper tube, and the other end terminates in a 1" F1960 PEX expansion connection, letting installers tie new PEX branch lines directly into existing copper stub-outs or manifolds without adapters stacked on adapters. The fitting is cast as a single piece of no-lead brass, eliminating a potential leak point at a secondary joint and giving the transition a full, unrestricted flow path with no internal shoulder to choke water delivery. This part ships from Sioux Chief's United States manufacturing and carries a Prop 65 warning as noted by the manufacturer.

Key Features

  • Trade Size: 1" FSWT x 1" F1960 for direct copper-to-PEX transitions in rough-in supply lines.
  • Durable Construction: One-piece no-lead brass body resists corrosion and avoids an added union joint between the sweat and PEX ends.
  • Connection Type: Female sweat (FSWT) fitting (FTG) end for soldering to 1" copper tube, paired with a 1" F1960 expansion end for PEX ring installation.
  • Full Flow Design: No internal restriction through the transition, maintaining water delivery volume across the copper-to-PEX joint.
  • No-Lead Compliance: Manufactured as a no-lead brass fitting for potable water rough-in applications.

Technical Specifications

  • Country of Origin: United States
  • Cubic Volume: 0.16509775
  • Packaging: 25 EA

Typical Applications

  • Copper-to-PEX Transitions in Rough-In Supply Lines
  • Residential and Commercial Water Distribution Retrofits
  • Manifold-Fed PEX Branch Line Connections
  • Repipe and Renovation Projects Transitioning from Copper to PEX
  • New Construction Rough-In Plumbing

Why Sioux Chief?

Sioux Chief manufactures this adapter as a single-piece no-lead brass casting, reducing the number of joints a plumber has to solder, crimp, or seal when bridging copper and PEX systems. The full-flow design and U.S.-manufactured brass construction give contractors a dependable, code-focused transition fitting for rough-in work where joint count and flow restriction matter.

Manufacturer Resources

Spec Sheet

Product Specs

Product Type:
Adapter
Connection Type:
Sweat x F1960 PEX Expansion
Standards:
No-Lead
Country of Origin:
United States
Department:
Plumbing
Product Group:
Plumbing Fittings
Product Subgroup:
Adapters
Product Material:
Brass
Product Size:
1"

Sioux Chief 644WG4 – Frequently Asked Questions

1) How does the Sioux Chief 644WG4 adapter connect copper to PEX?
The 644WG4 has two different ends: a 1 inch female sweat (FSWT) end you solder onto 1 inch copper tube, and a 1 inch F1960 end for cold expansion PEX with an expansion ring. No threads, no union, no stacked adapters, one brass casting between the two systems.
2) Is the FTG end on the Sioux Chief 644WG4 a male or female sweat connection?
It is a female sweat socket (FSWT) sized for 1 inch copper tube, meaning 1 inch Type L or M tube slips inside the fitting and you solder the joint. It does not have a fitting-size male end that drops into another socket, so plan the copper stub-out as a plain tube end.
3) Is the 644WG4 adapter safe for potable water lines?
The body is no-lead brass, made for potable water rough-in supply work, so it suits domestic hot and cold distribution, manifold branch lines, and repipe work. Sioux Chief notes a Prop 65 warning on the part.
4) Will a copper-to-PEX brass adapter restrict flow on a 1 inch branch line?
Not this one. The 644WG4 is cast as a single piece with no internal shoulder through the transition, so the 1 inch path stays full bore across the copper-to-PEX joint. That matters on a 1 inch trunk or manifold feed where stacking a sweat adapter onto a threaded PEX adapter would add both a restriction and an extra leak point.
5) Can I solder the 644WG4 after the PEX ring is expanded onto it?
Solder the copper side first, then let the fitting cool before making the PEX expansion connection. Torch heat travels through the one-piece brass body, and PEX tubing and the expansion ring sit directly on the opposite end. Standard practice on any sweat-by-PEX brass transition.
6) How many Sioux Chief 644WG4 adapters come in a box?
Standard packaging is 25 each, which suits a repipe or multi-family rough-in where you are transitioning several risers or manifold feeds. The orderable item is model 644WG4.
7) Where is the Sioux Chief 644WG4 made?
United States. For institutional and government jobs with domestic sourcing requirements on plumbing fittings, this brass adapter is US manufactured by Sioux Chief.
How fast can I get the Sioux Chief 644WG4 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 644WG4 come with a warranty?
Absolutely. The Sioux Chief 644WG4 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 644WG4?
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 644WG4 from ZenSupply?
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