Spence brand temperature and pressure regulator type ET124/ET134 has a variety of uses. Designed specially for; Instantaneous Heaters,Jacketed Kettlers,Storage Heaters, Oil Heaters,Batch Heating,Process Heating,Vats,Drivers and Ovens. Available in Cast Iron or Steel, ET124 and ET134 are for heater operating pressure between 20 and 125(ET124 only). While type E2T134 for heating operating pressures up to 15 psi