Sioux Chief 645X3P 3/4" PEX x PVC Water Service Transition Coupling

Sioux Chief 645X3P 3/4" PEX x PVC Water Service Transition Coupling

The Sioux Chief 645X3P is a 3/4" PEX x 3/4" PVC transition coupling designed to join PEX tubing and PVC pipe on the water service line. Built from Type L copper tube, this one-piece coupling gives rough-in plumbers and contractors a solid, dependable connection point when a water service run transitions from one pipe material to another. It is intended strictly for cold water applications and should never be exposed to service temperatures above 140° F. The 3/4" PEX x 3/4" PVC sizing makes it a straightforward fit for standard residential and light commercial water service installations, whether the job is new construction or a repair and replacement.

Key Features

• Trade Size: 3/4" PEX x 3/4" PVC transition sizing for standard residential and light commercial water service line runs.
• Durable Construction: Manufactured from Type L copper tube, giving the coupling body the strength and rigidity needed for a long-lasting connection between dissimilar pipe materials.
• Water Service Transition: Purpose-built to transition water service lines from PEX tubing to PVC pipe, or from PVC to PEX, without requiring a multi-fitting workaround.
• One-Piece Coupling Design: A single fitting handles the material transition in one connection point, simplifying the rough-in on the water service run.
• Temperature Limit: Rated for cold water applications only — do not exceed a 140° F service temperature.
• Application Versatility: Streamlines material transitions on water service lines in both new construction and repair or replacement plumbing work.

Technical Specifications

• Country of Origin: United States
• Packaging: Sold 50 EA per carton, sized for distributor and contractor stock replenishment.
• Service Temperature: Cold water only; do not exceed 140° F.

Typical Applications

• Water Service Line Transitions
• Residential and Commercial Rough-In Plumbing
• PEX to PVC Pipe System Connections
• Cold Water Supply Installations
• New Construction and Repair or Replacement Plumbing
• Water Meter and Service Entrance Piping Runs

Why Sioux Chief?

Sioux Chief manufactures this transition coupling from Type L copper tube, giving contractors and plumbing professionals a dependable fitting for joining PEX and PVC on the water service line. For rough-in work where different pipe materials meet, a solid copper-tube transition fitting like this one from Sioux Chief helps keep the connection point consistent and trade-ready for cold water service applications. Stocked 50 EA per carton, it is sized for distributors and plumbing contractors who need a dependable transition fitting on hand for water service line work.