Watts 4.5 G Potable Expansion Tank for 50-Gallon Water Heaters, DET-12, Blue
Brand: Watts
Color: Blue
For use with all types of direct-fired water heaters.
Controls thermal expansion of water in open domestic hot water supply systems.
Keeps system pressure below relief setting of relief valve.
Contains a durable membrane to prevent contact of water with air in the tank.
Rugged butyl diaphragm.