Sioux Chief 645WP2 Pex-a Poly Coupling 1/2 in F1960

Product Description

The SIOUX CHIEF 645WP2 is a 1/2-inch F1960 x 1/2-inch F1960 expansion-style poly coupling designed for PEX-A piping systems. It connects two lengths of 1/2-inch PEX-A tubing using the ASTM F1960 cold-expansion method, creating a reliable, lead-free joint without open flame or solvent cement. The fitting is manufactured from engineered polymer and is suited for potable water distribution and hydronic applications. Licensed plumbers and PEX-trained installers working on residential or light commercial plumbing systems are the primary users of this fitting.

This coupling fits into standard PEX-A rough-in work where straight inline connections are needed — repairs, extensions, or new runs in water supply systems. F1960 fittings require an expansion tool to enlarge the PEX-A tube end before the fitting is inserted; the tubing then contracts around the fitting for a permanent, pressure-rated seal. This fitting is appropriate for both hot and cold water supply lines in residential and light commercial construction.

Key Features

• F1960 cold-expansion connection on both ends — no flame, no crimping tool required
• 1/2-inch x 1/2-inch straight inline coupling for PEX-A tubing
• Engineered poly construction — lead-free and corrosion-resistant
• Compatible with standard F1960 PEX expansion tools and rings
• Suitable for potable water and hydronic distribution systems

Compatibility

Designed for use with 1/2-inch PEX-A tubing in F1960 expansion-style plumbing systems. F1960 poly fittings are not compatible with PEX-B or PEX-C crimp or clamp installation methods.

Installation Notes

Installation requires a calibrated F1960 PEX expansion tool and appropriately sized expansion rings. Shut off the water supply and relieve system pressure before cutting into any existing line. Work must comply with applicable local plumbing codes and the International Plumbing Code (IPC) where adopted. Allow the expanded tube end adequate time to contract fully onto the fitting before pressurizing the system.

Technical Specifications

• Connection Type: F1960 Cold Expansion (both ends)
• Size: 1/2 inch x 1/2 inch
• Material: Engineered Polymer (Poly)
• Compatible Tubing Type: PEX-A
• UPC: 739236423870

Standard Information

• Brand: SIOUX CHIEF
• Manufacturer Part Number: 645WP2