Watts 0066608 XpansionTank Refrigerant Use the keyswitch to toggle

Use the keyswitch to toggle between Sensor 1 and Sensor 2 for individual testing

which is ideal for water and glycol but not recommended for high-concentration mineral oils

and allergens to protect indoor air quality

The rugged construction resists corrosion typical in mechanical rooms and outdoor enclosures

Key Benefits Precision Balancing: Factory-set balance minimizes shaft vibration

Watts 0066608 XpansionTank Refrigerant Use the keyswitch to toggleThe Watts 0066608, also identified as the ETX 90, is a high capacity hydronic expansion tank engineered to manage thermal expansion in closed loop heating and cooling systems. As the updated version for the legacy ET 90 and ETX 90 models, this unit provides a 15 gallon total tank volume with a 3 4" MNPT connection for seamless integration into supply piping. The carbon steel tank features a rugged butyl diaphragm that physically separates system water