BackStop® 10-Gallon Thermal Expansion Tank (Model: 12-A110)

Product Overview

The BackStop® A Series (Non-ASME) thermal expansion tanks are fixed-diaphragm, pre-charged devices designed to protect potable water systems. They safely absorb expansion forces and control the excessive pressure generated inside water heaters.

By utilizing a sealed, compressible air cushion space to temporarily hold the expanded water volume, these tanks prevent the damaging effects of thermal expansion and system waterlogging. Water is entirely contained within a heavy-duty diaphragm paired with a polypropylene liner, preventing tank corrosion.

Technical Specifications

The following specifications apply strictly to Model 12-A110:

Parameter	Specification
Model Number	12-A110
Total Tank Volume	10 Gallons
Height	20"
Diameter	$11-1/2^{\prime\prime}$
System Connection	$3/4^{\prime\prime}$ Stainless Steel
Product Weight	13.5 lbs.

Materials & Operating Limitations

Materials of Construction

Shell: Carbon Steel
System Connection: 304 Stainless Steel
Tank Coating: Triple Layer Electrostatic Almond Paint
Diaphragm: Heavy-Duty Butyl Rubber
Liner Material: FDA-Grade Polypropylene

Operating Parameters

Factory Pre-set Pressure: 35 PSI
Maximum Design Pressure: 150 PSI
Maximum Design Temperature: $200^{\circ}\text{F}$
Certifications: IAPMO Certified / UPC

Installation Guidelines

Placement: The tank must be installed directly on the cold water line feeding the water heater.
Location Selection: Choose an installation area where potential leakage will not cause property damage and where access to ideal water drainage is available.

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