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