Sioux Chief sc-644x3 Pex to Female Sweat Adapter

Product Description

The SIOUX CHIEF sc-644x3 is a straight adapter fitting designed to transition between 3/4 inch PEX tubing and 3/4 inch female sweat copper connections. Part of the PowerPEX line, this fitting is constructed lead free, making it suitable for potable water systems where compliance with lead-free standards is required. The barb end grips PEX tubing securely when installed with the appropriate crimp or clamp ring, while the female sweat end connects to standard copper pipe using common soldering techniques. Plumbers and pipefitters use this adapter in residential and light commercial plumbing installations where PEX and copper systems meet.

This adapter is used wherever a PEX distribution run needs to tie into an existing copper system or transition at a fixture, valve, or manifold connection point. Typical applications include remodel work, new construction rough-in, and retrofit installations where copper stub-outs are already in place. The straight configuration keeps the transition compact and straightforward in tight spaces.

Key Features

• Lead-free construction suitable for potable water applications
• 3/4 inch PEX barb end compatible with standard crimp or clamp ring installation methods
• 3/4 inch female sweat end accepts standard copper pipe for soldered connection
• Straight adapter configuration for in-line transitions between PEX and copper
• Part of the SIOUX CHIEF PowerPEX fitting system

Compatibility

Designed as an OEM-style replacement and new-installation fitting for residential and light commercial plumbing systems using 3/4 inch PEX tubing with 3/4 inch copper sweat connections.

Installation Notes

Installation is performed by licensed plumbers or qualified pipefitters. Shut off the water supply and depressurize the line before beginning work. The female sweat end requires standard copper soldering practices in accordance with applicable plumbing codes such as the IPC. The PEX barb end must be secured with a properly sized crimp ring or clamp ring using the correct installation tool — do not rely on friction fit alone.

Technical Specifications

• Connection Type: 3/4 inch PEX Barb x 3/4 inch Female Sweat Copper
• Configuration: Straight Adapter
• Lead Free: Yes
• Product Line: PowerPEX

Standard Information

• Brand: SIOUX CHIEF
• Manufacturer Part Number: sc-644x3