Neo-Pure Thermal Expansion Tank 0.52 gal (2 Liter) 3/4 MNPT - Gray Choose::Single Watts recommends changing your battery

Watts recommends changing your battery each time you replace your filter cartridges

Self-priming against maximum working pressure

Chemical-resistant construction for harsh water conditions

2 (AAA) alkaline batteries

3M Part Number: 70020007509

Neo-Pure Thermal Expansion Tank 0.52 gal (2 Liter) 3/4 MNPT - Gray Choose::Single Watts recommends changing your batteryThe Neo Pure Thermal Expansion tanks are designed for residential water heater and hot water storage tank systems to manage the increased water volume caused by thermal expansion. By maintaining consistent pressure throughout the water supply system, these tanks help protect against over pressure conditions and extend the life of the system. A durable internal membrane separates air and water, ensuring reliable performance over time. Thermal Expansion