Sioux Chief 654X2GPK2 1/2" F18...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$2.40
Sioux Chief 654X2GPK2 1/2" F1807 PEX x 1/2" PB Transition Coupling

Sioux Chief 654X2GPK2 1/2" F1807 PEX x 1/2" PB Transition Coupling

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Model: 654X2GPK2

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

$2.40
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Sioux Chief 654X2GPK2 1/2" F1807 PEX x 1/2" PB Transition Coupling

The Sioux Chief 654X2GPK2 is a 1/2" F1807 PEX x 1/2" PB transition coupling built for rough-in plumbers connecting new PEX crimp tubing to existing polybutylene (PB) pipe runs. One end accepts a 1/2" F1807 PEX crimp connection while the opposite end mates to 1/2" polybutylene pipe, letting a crew extend, repair, or partially re-route a PB system without cutting back to a full repipe. It is a straightforward, behind-the-wall fitting sized for standard 1/2" rough-in runs, meant to be installed under a floor, inside a wall cavity, or in a crawlspace rather than displayed as a finished fixture. Because it bridges two different pipe materials at one fixed trade size, it is intended for point-of-repair transitions rather than as a general-purpose coupling for matched pipe systems.

Key Features

  • Trade Size: 1/2" x 1/2", matching common 1/2" PEX tubing and 1/2" polybutylene branch and supply runs found in residential rough-in.
  • F1807 Crimp End: One end is sized to ASTM F1807 PEX crimp dimensions, accepting a standard copper crimp ring and crimp tool for a secure, mechanically set PEX termination.
  • PB Transition End: The opposite end connects directly to existing 1/2" polybutylene pipe, allowing a plumber to tie new PEX tubing into a legacy PB system at the exact point of repair.
  • Repair-Friendly Design: Purpose-built for retrofit and repair work where only a section of an aging polybutylene run needs to be replaced, rather than the entire branch or riser.
  • Single-Piece Coupling: A one-piece body carries both connection ends, keeping the transition to a single fitting rather than stacking multiple adapters at the repair point.
  • Compact Rough-In Fitting: Sized and configured for behind-the-wall and under-floor installation alongside other rough-in plumbing components in the same run.

Technical Specifications

  • Refer to manufacturer documentation for complete technical specifications.

Typical Applications

  • Polybutylene (PB) Pipe Repair and Retrofit
  • PEX-to-Polybutylene System Transitions
  • Residential Rough-In Plumbing Repairs
  • Behind-the-Wall and Under-Floor Supply Line Connections
  • Point-of-Failure Repairs on Older Polybutylene Runs
  • Renovation Work on Homes Still Plumbed with Polybutylene Pipe

Why Sioux Chief?

Sioux Chief is a trade-focused manufacturer of rough-in plumbing fittings, and the 654X2GPK2 reflects that focus with a simple, single-purpose transition coupling sized to match standard 1/2" F1807 PEX crimp and 1/2" polybutylene connections. For plumbers and contractors working on legacy PB systems, it offers a direct way to bring a repair up to current PEX tubing without reworking the entire run, keeping labor and material focused on the section that actually needs replacing. Stocking this transition coupling lets a service plumber respond to a polybutylene failure with a PEX-compatible repair on the same truck run.

Product Specs

Product Type:
Coupling
Connection Type:
Crimp
Standards:
ASTM F1807
Department:
Plumbing
Product Group:
Rough-In and Supports
Product Subgroup:
Fittings and Valves
Product Size:
1/2"

Sioux Chief 654X2GPK2 – Frequently Asked Questions

1) Can I tie new PEX into an existing polybutylene line with the Sioux Chief 654X2GPK2?
That is exactly what the 654X2GPK2 is for. One end takes a 1/2 inch F1807 PEX crimp connection, the other mates to 1/2 inch polybutylene pipe, so you can splice new PEX into a legacy PB run at the point of failure instead of repiping the whole branch. Both ends are fixed at 1/2 inch, so it only works where the PB and the new PEX are both 1/2 inch.
2) Is this a general purpose 1/2 inch coupling for joining two PEX lines?
No. The 654X2GPK2 is a dissimilar material transition: PEX crimp on one end, polybutylene on the other. For joining PEX to PEX you want a straight F1807 PEX crimp coupling with the same socket on both ends. Use this one only where a PB pipe is on one side of the joint.
3) Do I need two adapters to get from polybutylene to PEX?
Not with this one. The 654X2GPK2 carries both connection ends on a single body, so the transition is made with one fitting rather than stacking a PB adapter onto a PEX adapter. Fewer joints at the repair point.
4) I manage rental units still plumbed in polybutylene. Does this let me repair just the failed section?
Yes. Rather than cutting a PB branch back for a full repipe, you cut out the failed section and transition into new 1/2 inch PEX at each end with these couplings. That keeps labor and material on the piece that actually failed, which is why service plumbers carry them on the truck for PB callbacks.
5) Can this coupling be buried in a wall or under a floor, or does it need to stay accessible?
It is a rough-in fitting meant to be installed behind the wall, under a floor, or in a crawlspace alongside other rough-in components. It is not a finished or trim fitting. Keep in mind access requirements in your local code still govern mechanical joints in concealed locations.
6) What is the manufacturer part number for the Sioux Chief 1/2 inch PEX to PB coupling?
Sioux Chief 654X2GPK2. It is sold as a single 1/2 inch size, so there is no handing, length, or finish to specify on the order.
How fast can I get the Sioux Chief 654X2GPK2 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 654X2GPK2 come with a warranty?
Absolutely. The Sioux Chief 654X2GPK2 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 654X2GPK2?
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 654X2GPK2 from ZenSupply?
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