Sioux Chief 645XC Series Dual-...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$4.94
Sioux Chief 645XC Series Dual-Material CPVC x PEX Transition Coupling

Sioux Chief 645XC Series Dual-Material CPVC x PEX Transition Coupling

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Model: 645XC2

In Stock (leaves warehouse same day if ordered before 3pm ET)

$4.94
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Sioux Chief 645XC Series Dual-Material CPVC x PEX Transition Coupling

The Sioux Chief 645XC Series is a line of dual-material CPVC x PEX transition couplings built to join underground PEX water service lines to CPVC in-house piping at the point where the service line enters the structure. The family spans three coupling models — 645XC2, 645XC3, and 645XC4 — covering sizes from 1/2" to 1", so plumbers can match the coupling to the CPVC and PEX line sizes on the job. Each coupling accepts a CPVC connection on one end and a PEX connection on the other, completing the material transition in a single dual-material fitting instead of stacking field-fabricated adapters. Manufactured in the USA and packaged 20 pieces per case, the 645XC Series is built for straightforward distributor and contractor stocking.

Key Features

  • Size Range: Available in 1/2", 3/4", and 1" sizes across the 645XC2, 645XC3, and 645XC4 models to match CPVC and PEX line sizes on the job.
  • CPVC-to-PEX Transition: Purpose-built to connect underground PEX water service lines directly to CPVC in-house piping at the point of entry, without an intermediate material.
  • Dual-Material Coupling Body: One coupling body accepts a CPVC connection on one end and a PEX connection on the other, eliminating the need for a separate adapter fitting or extra union at the transition.
  • Quick, Easy Installation: Delivers a quick and easy transition between pipe materials, simplifying service-line hookups for plumbing contractors on new construction and repair work.
  • Made in the USA: Manufactured in the United States, supporting domestic sourcing requirements on applicable jobs.
  • Case Packaging: Packaged 20 pieces per case for efficient distributor stocking and contractor truck inventory.

Technical Specifications

  • Series: 645XC (Models 645XC2, 645XC3, 645XC4).
  • Size Range: 1/2" to 1".
  • Coupling Material: Dual-Material CPVC/PEX construction.
  • Country of Origin: United States.
  • Case Packaging: 20 pieces per case.

Typical Applications

  • Underground PEX Water Service Line Connections
  • CPVC In-House Plumbing Systems
  • Residential and Commercial Water Supply Transitions
  • New Construction Water Service Installations
  • Plumbing Renovation and Repipe Projects
  • Point-of-Entry Material Transitions at the Foundation Wall

Why Sioux Chief?

Sioux Chief engineers the 645XC Series to give plumbing professionals a straightforward, dependable way to transition between CPVC and PEX piping without improvising a field workaround at the service entry. Manufactured in the United States and packaged in case quantities of 20 for job-ready stocking, the 645XC Series spans three coupling models — 645XC2, 645XC3, and 645XC4 — covering sizes from 1/2" to 1" so contractors can match the correct CPVC x PEX size to underground service entries and in-house distribution runs alike. Choosing a purpose-built dual-material transition coupling over field-fabricated adapters helps installers keep the CPVC-to-PEX connection quick, consistent, and easy to inspect on both new construction and repipe projects.

Product Specs

Country Of Origin:
United States
Product Type:
Transition Coupling
Series:
645XC
Configuration:
CPVC x PEX Transition
Department:
Plumbing
Product Group:
Rough-In and Supports
Product Subgroup:
Fittings and Valves
Product Material:
CPVC/PEX Dual-Material
Product Size:
1/2" - 1"
Country of Origin:
USA

Sioux Chief 645XC2 – Frequently Asked Questions

1) What does the Sioux Chief 645XC coupling actually connect?
The 645XC is a dual-material transition coupling: one end takes a CPVC connection, the other takes PEX. It is built for the point where an underground PEX water service line enters the structure and ties into CPVC in-house piping, so you make the material change in one fitting instead of stacking adapters.
2) What sizes does the Sioux Chief 645XC transition coupling come in?
Three sizes, matched to the line size at the transition: 1/2 inch (645XC2), 3/4 inch (645XC3), and 1 inch (645XC4). Pick the one that matches the CPVC and PEX line sizes at your service entry.
3) Will the 645XC work on a repipe where the house is CPVC but the new buried line is PEX?
That is exactly the case it is built for. Typical applications listed include renovation and repipe work, underground PEX service line connections, and point-of-entry material transitions at the foundation wall, in both residential and commercial water supply. Size the coupling to the existing CPVC and the new PEX, from 1/2 inch up to 1 inch.
4) Is there a 645XC coupling larger than 1 inch for a bigger water service line?
No. The 645XC Series tops out at 1 inch, with models 645XC2 (1/2"), 645XC3 (3/4") and 645XC4 (1"). A service line above 1 inch needs a different transition method.
5) Can I use a CPVC x PEX coupling instead of threading a male adapter into a female adapter at the service entry?
That is the point of the 645XC. A single dual-material body carries the CPVC socket on one side and the PEX end on the other, so you drop the intermediate adapter or union entirely. Fewer joints at the foundation wall, and the transition is easier to inspect.
6) Is the Sioux Chief 645XC coupling made in the USA for a domestic sourcing spec?
Yes, the 645XC Series is manufactured in the United States, which covers jobs carrying a domestic-sourcing requirement on plumbing materials.
7) How are Sioux Chief 645XC couplings packaged for stocking?
Twenty pieces per case. That is the quantity to plan around for shelf stock or truck inventory across the 1/2, 3/4 and 1 inch sizes.
8) What material is the 645XC coupling body itself?
It is a dual-material CPVC/PEX construction, meaning the body is purpose-built with a CPVC connection on one end and a PEX connection on the other rather than being a single-resin fitting with an adapter bonded on.
How fast can I get the Sioux Chief 645XC2 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Sioux Chief 645XC2 come with a warranty?
Absolutely. The Sioux Chief 645XC2 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Sioux Chief 645XC2?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Sioux Chief 645XC2 from ZenSupply?
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