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Watts® Thermostatic Mixing Valve 3/4 " 100-180 Degrees
Part 640326
Brand Watts
Free Shipping
in lower 48 states
Usually ships Next Day
Hassle-free returns

About this item

  • Watts® Thermostatic Mixing Valve
  • Designed For Mixing Hot And Cold Water On Hot Water Supply Systems To Reduce Temperature Of Hot Water - Cannot Be Used For Tempering Water At Fixtures, Does Not Prevent Anti-Scald
  • Ideal For Source Of Supply, Radiant Heat, Boiler Or Water Heater Applications
  • 0.75" Sweat Connection
  • Temperature Range 90°-160°F
  • ASSE 1017 Listed
  • Mfg #1170-US - M1
California residents: Prop 65 Warnings


This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to

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