Sioux Chief Copper Lead-Free Expansion Tank

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.