Description
The Watts 0066607 ET-60 Expansion Tank is a hydronic pressure-control vessel designed to accommodate fluid expansion as system temperature changes. Its 6.6-gallon capacity provides the internal volume needed to accept expanding system water, while the 1/2″ connection establishes the specified interface with the connected piping circuit. The internal diaphragm separates the system fluid from the pressurized air chamber, allowing the tank to absorb changes in fluid volume and moderate pressure variation within HVAC systems. It works alongside circulating equipment and hydronic piping as part of the thermal expansion control arrangement.
