Sioux Chief Copper Lead-Free E...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1.91
Sioux Chief Copper Lead-Free Expansion Tank

Sioux Chief Copper Lead-Free Expansion Tank

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Model: COPPER

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

$1.91
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Sioux Chief Copper Lead-Free Expansion Tank

The Sioux Chief Copper Lead-Free Expansion Tank is a rough-in plumbing accessory built with copper construction and a lead-free (LF) design for use in potable water supply systems. Expansion tanks like this one are installed on a home or building's water supply line to absorb the increase in water volume that occurs when water is heated, helping to relieve excess pressure that would otherwise be pushed back through the plumbing system. Because it is manufactured from copper and meets lead-free requirements, this tank is suited for direct connection into potable water piping where low-lead compliance matters. As with all Sioux Chief rough-in products, it is designed to be installed behind the wall, under the floor, or in a mechanical space alongside the water lines it protects, rather than as a visible, finish-grade fixture.

Key Features

  • Copper Construction: Built from copper for durability and corrosion resistance in potable water plumbing applications.
  • Lead-Free (LF) Design: Manufactured to lead-free standards, supporting use on potable water supply lines.
  • Thermal Expansion Control: Functions as an expansion tank, absorbing the added volume created when water is heated to help manage system pressure.
  • Rough-In Installation: Designed for behind-the-wall, under-floor, or mechanical-room installation as part of a professional plumbing rough-in.
  • Professional-Grade Plumbing Component: Sized and constructed for use by licensed plumbers and contractors on residential and light-commercial water systems.

Technical Specifications

  • Product Type: Expansion Tank
  • Material: Copper
  • Lead Content: Lead-Free (LF)

Typical Applications

  • Potable Water Supply Line Installations
  • Residential and Light-Commercial Rough-In Plumbing
  • Water Heater and Closed Water System Pressure Management
  • New Construction Plumbing Rough-In
  • Plumbing Renovation and Repipe Projects

Why Sioux Chief?

Sioux Chief is a trusted name in rough-in plumbing supply, manufacturing the fittings, tanks, and connection components that plumbers and contractors rely on for the parts of a system that go behind the wall and under the floor. This copper, lead-free expansion tank reflects that same focus on durable materials and potable-water-safe construction, giving installers a dependable component for managing thermal expansion on the water lines they are already running. For pros stocking a truck or a supply house shelf, Sioux Chief parts are built to fit into standard rough-in workflows without surprises.

Manufacturer Resources

Sioux Chief Product Catalog

Product Specs

Product Type:
Expansion Tank
Department:
Plumbing
Product Group:
Rough-In and Supports
Product Subgroup:
Fittings and Valves

Sioux Chief COPPER – Frequently Asked Questions

1) What does a Sioux Chief copper lead-free expansion tank actually do on a water heater installation?
It absorbs the extra water volume created when the heater warms the water. On a closed system (one with a backflow preventer or pressure reducing valve), that expanding water has nowhere to go and pressure spikes, which stresses the piping, fittings and the heater's relief valve. The copper lead-free tank takes that volume and keeps system pressure in check. It mounts on the supply line, not as a finish fixture.
2) Can this expansion tank be connected directly to potable drinking water piping?
Yes. The tank is built to lead-free (LF) requirements and made of copper, so it is intended for direct connection into potable water supply piping where low-lead compliance matters.
3) Do I still need an expansion tank if the house already has a pressure reducing valve?
That's exactly when you need one. A pressure reducing valve or backflow preventer turns the plumbing into a closed system, so heated water can't push back into the main. Without a tank to take the expansion, pressure climbs until the heater's T and P relief valve weeps. The Sioux Chief copper lead-free tank is the component that handles that volume on a potable supply line.
4) Why pick a copper expansion tank instead of a steel bladder-type tank?
Material is the difference that matters here. The Sioux Chief unit is copper, which resists corrosion on the potable side and is lead-free, so it goes straight into copper water lines without a dissimilar-metal transition. Painted steel tanks are the common alternative on water heater installs and are generally the lower-cost route, but they put a steel shell and a separate bladder in contact with the supply water. If the spec or the inspector is focused on potable-water material and low-lead compliance, copper is the one to call out.
5) Where should the expansion tank be installed in the system?
Behind the wall, under the floor, or in the mechanical space alongside the water lines it protects. It's a rough-in component on the cold water supply line, not a visible finish-grade fixture, so plan the location while the lines are still open.
6) Is a Sioux Chief copper expansion tank suitable for commercial work or residential only?
Both, within limits. It is built for residential and light-commercial water systems, including new construction rough-in, renovations and repipes. For heavy commercial or large institutional hot water plant, size the expansion volume to the system rather than assuming a light-commercial component covers it.
How fast can I get the Sioux Chief COPPER 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 COPPER come with a warranty?
Absolutely. The Sioux Chief COPPER 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 COPPER?
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 COPPER from ZenSupply?
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