This Rite-Temp pressure-balancing valve works behind the scenes to prevent scalding and freezing for a safe, comfortable water supply. The valve features a high-temperature limit stop and an optimal comfort zone, so you can set a maximum high and then find and maintain your desired water temperature. Additionally, the unit has a diaphragm design that virtually eliminates freeze-ups from contamination and water debris. F1807 PEX fittings on valve inlets allow tubing to be crimped directly to valve without installing separate fittings.