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Watts ETX-30 EXT Series Steel 4.5 Gallon Water Expansion Tank - 1/2 MNPT

Mfr. Model #:
ETX-30 (0066606)
KR Part #:
10.00 lbs
Usually Ships in 2 Weeks
Now Only!
Carbon steel expansion tank with a butyl diaphragm. 1/2" MNPT, 12 PSI precharge, 75 PSI max working pressure.

Technical Specifications

Max PSI: 75
Max Temperature: 220 degrees F
Inlet Port: 1/2 inch

Product Description

Precharged Expansion Tank with Diaphragm

The Watts ETX-30 Expansion Tank is used in closed loop hydronic heating systems in both commercial and residential applications. This steel tank is installed into the supply piping to control the thermal expansion of hot water and maintain a pressure level below the system's relief valve setting. This ETX Series 4.5 gallon tank is made of carbon steel with a gray epoxy finish and features a rugged butyl diaphragm. It is precharged to 12 PSI and has a 1/2" MNPT pipe connection.

Dimensions: 11" diameter x 14" height

Specifications and Features:

  • 12 PSI air precharge
  • 75 PSI maximum working pressure
  • 4.5 gallon tank volume
  • 2.5 gallon tank acceptance at 12 PSI
  • 1/2" male NPT connection
  • 0.302-32 inch charging valve connection (standard tire valve)
  • Butyl diaphragm
  • Gray epoxy finish
  • Carbon steel construction
  • 220° Fahrenheit maximum operating temperature
  • Pipe mounting type


  • 098268219357

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