Cart Mixing Valves Mixing valves protect against thermal shock in hydronic heating systems and scalding in domestic hot water systems. View cart “Taco 5002 1/2″ Copper Solder Mixing Valve (Low Lead)” has been added to your cart. Apollo Mixing Valves (8) Danfoss Mixing Valves (18) Sharkbite Mixing Valves (2) Taco Mixing Valves (5) Watts Mixing Valves (7)