Sioux Chief 644XG Series No-Lead FSWT x PEX Transition Adapter for Potable Water Lines

Sioux Chief 644XG Series No-Lead FSWT x PEX Transition Adapter for Potable Water Lines

The Sioux Chief 644XG Series No-Lead FSWT x PEX Transition Adapter gives plumbing professionals a code-focused fitting for transitioning copper female sweat (FSWT) connections to PEX tubing on potable water supply lines. This no-lead adapter is available in 1/2" and 3/4" sizes as models 644XG2 and 644XG3, letting installers match the fitting to the exact pipe size required on a given rough-in run without switching product lines. Built with a no-lead body suited to potable water use, the 644XG Series fits new construction plumbing and retrofit or repair work where a clean copper-to-PEX transition point is needed.

Key Features

• Trade Size Range: Available in 1/2" and 3/4" sizes (models 644XG2 and 644XG3) so installers can match the fitting to the job at hand.
• FSWT x PEX Connection: Joins a copper female sweat (FSWT) fitting directly to PEX tubing, creating a single solder-side transition without extra adapters in the run.
• No-Lead Construction: No-lead adapter body supports use on potable water supply lines where lead-free fittings are required by code.
• Single-Fitting Transition: Combines the sweat and PEX connection points into one adapter, simplifying rough-in work and reducing the fitting count at a transition point.
• Manufacturing Quality: Manufactured in the United States, supporting consistent quality control across every size in the 644XG Series.
• Bulk Packaging: Packaged 500 EA per case, suited to distributor stocking programs and higher-volume contractor purchasing.

Certifications & Compliance

• No-Lead / Lead-Free Compliant Construction
• Suitable for Potable Water Supply Lines

Technical Specifications

• Product Type: PEX Adapter
• Series: 644XG (Models 644XG2, 644XG3)
• Connection Type: FSWT x PEX
• Trade Size Range: 1/2" - 3/4"
• Country of Origin: United States

Typical Applications

• Residential and Commercial Plumbing Installations
• Copper-to-PEX Transitions
• Potable Water Supply Line Repairs and Retrofits
• New Construction Plumbing Rough-In
• Distributor and Contractor Bulk Stocking Programs

Why Sioux Chief?

Sioux Chief has built a reputation among plumbing contractors and distributors for fittings that perform reliably under real jobsite conditions. The 644XG Series No-Lead Adapter reflects that same commitment, offering a no-lead FSWT x PEX transition that helps installers keep copper-to-PEX connections consistent across residential and commercial projects. Manufactured in the United States with consistent quality control and packaged for volume use at 500 EA per case, the 644XG Series is a straightforward, dependable choice across both its 644XG2 and 644XG3 configurations, giving distributors and contractors one no-lead solution for copper-to-PEX transitions on any potable water rough-in, whether sized at 1/2" or 3/4".