Sioux Chief 645X3P 3/4 Inch Pex to Pvc Coupling

Product Description

The SIOUX CHIEF 645X3P is a straight adapter coupling designed to connect 3/4-inch PEX tubing (ASTM F1807 crimp-ring style) directly to 3/4-inch PVC pipe. This transition fitting bridges two of the most common piping materials in residential and light commercial plumbing systems, allowing techs to tie PEX supply runs into existing PVC distribution or drain lines without additional adapters. It is a compact, single-piece fitting suited for supply plumbing work in new construction and retrofit applications where PEX and PVC systems meet at a single transition point.

This coupling is used in residential and light commercial plumbing installations where a direct PEX-to-PVC connection is required. Typical scenarios include transitioning from a PVC main line to a PEX branch supply, connecting PEX remodel work back into an existing PVC system, or completing rough-in where two piping materials converge. The F1807 PEX end accepts a standard crimp ring installed with a go/no-go gauge tool, while the PVC end mates with standard schedule pipe and solvent cement.

Key Features

• 3/4-inch F1807 PEX crimp-ring inlet for use with standard PEX crimp tooling
• 3/4-inch PVC outlet compatible with standard schedule PVC solvent-weld installation
• Single straight-through adapter design minimizes flow restrictions at the transition point
• Compact form factor fits in standard stud-bay and joist-bay rough-in spaces

Compatibility

Designed as an OEM-style transition fitting for plumbing systems requiring a direct connection between 3/4-inch ASTM F1807 PEX tubing and 3/4-inch PVC pipe.

Installation Notes

Installation should be performed by a licensed plumber in accordance with local plumbing codes and the International Plumbing Code (IPC). Shut off the water supply and relieve system pressure before beginning any fitting work. The PEX end requires a properly sized crimp ring and an F1807-compliant crimp tool; verify the connection with a go/no-go gauge before pressurizing. The PVC end requires clean, dry pipe and a compatible PVC solvent cement applied per the cement manufacturer's instructions.

Technical Specifications

• PEX End Size: 3/4 inches
• PEX Standard: ASTM F1807
• PVC End Size: 3/4 inches
• Configuration: Straight Adapter
• UPC: 739236495945

Standard Information

• Brand: SIOUX CHIEF
• Manufacturer Part Number: 645X3P