Amtrol® THERM-X-TROL® ST-12 In-Line Water Expansion Tank, 4.4 gal, 11 in Dia x 15 in H, 150 psi, Domestic

37742 MFG #: 141N43
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Amtrol® THERM-X-TROL® Water Expansion Tank, In-Line, Series: ST-12, 4.4 gal Tank, 11 in Dia, 15 in Height, 3/4 in NPTM, 150 psi, Steel, Urethane Topcoat, High Gloss Tan, Domestic

Thermal expansion occurs as domestic water is heated. Left unchecked, the resulting pressure increase can cause relief valve discharge and other potentially hazardous conditions. Therm-X-Trol® expansion tanks absorb this expanded water, keeping water pressure at a safe level.

  • Features
  • Antimicrobial liner neutralizes bacteria on contact
  • Turbulator™ water diffuser
  • 50 psi precharge - the industry's highest
  • Deep drawn steel domes for 2X the strength of other tanks
  • Thickest diaphragm for extra long life
  • Hoop and groove design for added reliability
  • Stainless steel system connection
  • Water heater manufacturers and plumbing codes require the installation of an expansion control device if a backflow preventer, pressure reducing valve or check valve is installed in the domestic supply line
  • Therm-X-Trol satisfies all manufacturers' requirements
  • Accepts expanded water as system temperature rises and returns hot water to system when demand occurs
  • Required by most building codes and water heater warranties
  • 50 psi factory precharge; the industry's highest
  • Standard/Approvals: ISO 9001 : 2008 Registered, NSF/ANSI 61 Certified
  • WARRANTY: 5 Years Limited