Manufacturer Name: Siemens Building Technology Product Number: 192-203 OEM Part Number: 192-203 Product Description: Rm Stat Ssp 45/85F 2 Pipe Ra Weight:0.63lbs/285.76g The Siemens 192-203 Pneumatic Room Thermostat is a means of precise temperature regulation for HVAC systems but is versatile. This thermostat operates at 18 to 25 PSI pressure range and is applied for heating as... https://www.partshnc.com/rm-stat-ssp-4585f-2-pipe-ra