The Faucet Parts by Zurn Industries: 3/4 FNPT AquaGard Thermostatic Mixing Valve, installs at the potable water heat source, inlet strainers and check valves included, low-lead law compliant, 5 1/2 x 3 1/2 x 5 7/16 ( Zurn Industries - 34-ZW1017XL )