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Distinguishing Between 1/2" and 3/4" Thermostatic Shower Systems

To quickly determine whether you have a 1/2" or 3/4" thermostatic shower system, look at the bottommost central thermostatic handle:

  • The 1/2" thermostatic shower system has a large control lever at the bottom
  • The 3/4" thermostatic shower system has a large cross handle at the bottom