Elbi 12-A102 - Backstop Thermal Expansion Tank - 4.5 Gallon

The Elbi Backstop A Series thermal expansion tank protects water heaters and closed-loop plumbing systems from excess pressure caused by thermal expansion. Designed for use in residential and light commercial potable water systems, it absorbs expanded water volume to prevent stress on pipes, valves, and appliances. With durable construction and a compact, pre-charged design, it ensures long-lasting performance and easy installation.

Features

• Industry-leading 6-year warranty on manufacturing defects
• Pre-pressurized with adjustable air charge (factory-set to 40 PSI)
• 100% butyl rubber diaphragm prevents waterlogging
• NSF-61 and NSF-372 certified for potable water systems
• High-grade steel with double-rolled seals for durability
• Epoxy-coated, appliance-grade finish for corrosion protection
• Compact vertical design with 3/4" NPT connection

Applications

• Residential and light commercial water heaters
• Plumbing systems with backflow preventers or check valves
• Any closed potable water system requiring thermal expansion control
• Systems where protection, efficiency, and warranty support matter

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