the Robertshaw 6000-105 is designed with a weatherproof and explosion-proof housing

The Danfoss 013G-8025 is a professional-grade 1" straight body thermostatic radiator valve (TRV) engineered for high-performance fluid control in residential and commercial 2-pipe hydronic heating and low-pressure steam systems

Constructed with a high-strength aluminum housing

they are all connected internally

Designed for vapor-filled capillary pneumatic action

Siemens Building Technology 599-10357 Valve 320720-756 the Robertshaw 6000-105 is designedThe Siemens Building Technology 599 10357 Valve is a professional grade 1 2 inch 3 way ball valve engineered for precise mixing or diverting flow control in commercial HVACR systems. Built with a rugged forged brass body (ASTM B283), this valve features a 10 Cv flow coefficient and a chrome plated brass ball with a blow out proof brass stem for enhanced safety and durability in high pressure environments. Designed for equal percentage flow