Sioux Chief CPVC Lead-Free Expansion Tank

Sioux Chief CPVC Lead-Free Expansion Tank

The Sioux Chief CPVC Lead-Free Expansion Tank is a rough-in plumbing component built to absorb the added water volume created by thermal expansion inside a closed potable-water system. Molded from CPVC (chlorinated polyvinyl chloride) and manufactured lead-free, this expansion tank is sized to tie into the water supply line near a water heater, helping to relieve the pressure spikes that heated water expansion can put on pipe, valves, and fixtures downstream. As a Sioux Chief product, it is built for professional rough-in installation on residential and light-commercial potable-water systems, where a compact, non-metallic expansion tank is preferred over a heavier steel alternative. Plumbers and contractors can spec this tank as part of a water heater rough-in or as a retrofit addition to an existing closed-loop supply system.

Key Features

• CPVC Construction: Molded CPVC body resists corrosion and scale buildup that can affect metal expansion tanks over time.
• Lead-Free (LF): Manufactured lead-free, in line with Sioux Chief's no-lead product offerings for potable-water contact.
• Expansion Tank Function: Absorbs excess water volume generated by thermal expansion to help reduce pressure stress on a closed water system.
• Rough-In Application: Sized for inline installation on the supply line, typically near the water heater, ahead of finish trim-out.
• Non-Metallic Body: CPVC construction offers a lightweight, corrosion-resistant alternative to steel expansion tanks for compatible installations.
• Sioux Chief Build: Manufactured by Sioux Chief for use alongside the brand's broader line of rough-in supply and drainage products.

Technical Specifications

• Product Type: Expansion Tank
• Material: CPVC
• Lead Compliance: Lead-Free (LF)
• Brand: Sioux Chief

Typical Applications

• Water Heater Installations
• Closed Potable-Water Systems
• Residential and Light-Commercial Rough-In Plumbing
• Thermal Expansion Control on Supply Lines
• New Construction and Remodel Plumbing Projects
• Retrofit Additions to Existing Closed-Loop Systems

Why Sioux Chief?

Sioux Chief is a longstanding manufacturer of rough-in plumbing products relied on by contractors and plumbers for consistent fit and function behind the wall. This CPVC, lead-free expansion tank carries that same focus on durable, non-metallic materials suited to potable-water applications. Specifying a Sioux Chief expansion tank gives installers a dependable, lead-free component for managing thermal expansion in a closed water system, backed by a brand plumbers already trust for other rough-in supply and drainage parts on the same jobsite.