Water Worker G12L 4.4 Gallon Expansion Tank

Water worker 4.4 gallon thermal expansion water heater safety tank. it has a steel outer shell, polypropylene lined water reservoir, heavy duty butyl diaphragm that flexes, leak proof precharged air chamber, reduces pressure build up & harmful pressure spikes in closed water systems, temporarily absorbs expanded water overflow. it is ul listed and has a maximum temperature of 200 degree fahrenheit. comes boxed.