Sioux Chief 645WP3 Pex-a Poly Coupling 3/4 in F1960

Product Description

The SIOUX CHIEF 645WP3 is a 3/4-inch F1960 x 3/4-inch F1960 PEX-A polypropylene coupling designed for joining PEX-A tubing in residential and commercial water distribution systems. The F1960 connection standard uses an expansion fitting method, where the PEX-A tubing and a fitting ring are expanded with an expansion tool, allowing the fitting to be inserted and the tubing to contract around it for a secure, leak-resistant connection. Plumbers and pipefitters install this coupling during rough-in work or repair applications where a straight inline connection is needed on 3/4-inch PEX-A lines.

This coupling is suited for potable water supply systems, radiant heating distribution lines, and hydronic applications where PEX-A tubing is the specified piping material. The F1960 expansion method is common in both new construction and retrofit projects. The 3/4-inch size is a standard trunk-line dimension in residential water distribution, making this coupling a frequently used fitting in whole-house plumbing installations.

Key Features

• F1960 expansion-style connection on both ends for use with PEX-A tubing
• 3/4-inch x 3/4-inch straight coupling for inline joins or repairs
• Polypropylene construction suited for potable water and hydronic applications
• Compatible with standard PEX-A expansion tools and PEX rings per ASTM F1960

Compatibility

Designed as an OEM-style replacement and new-installation fitting for 3/4-inch PEX-A piping systems using the ASTM F1960 expansion connection method.

Installation Notes

Installation is performed by licensed plumbers following applicable IPC or local plumbing code requirements. Shut off the water supply and depressurize the line before cutting or joining tubing. An ASTM F1960-compatible expansion tool and correctly sized PEX expansion rings are required to make the connection. Allow the tubing to fully contract around the fitting before pressurizing the system.

Technical Specifications

• Connection Type: F1960 Expansion (PEX-A)
• Inlet Size: 3/4 inches
• Outlet Size: 3/4 inches
• Material: Polypropylene
• UPC: 739236423894

Standard Information

• Brand: SIOUX CHIEF
• Manufacturer Part Number: 645WP3