Agilent Varian HS-20 HS16 Lower Thermal Switch, Diffusion Vacuum Pump Replacement Parts
Agilent Varian Part Number PN K9050002
This is a replacement lower thermal (boiler) switch. Fits the Agilent Varian HS-20 HS-16 Diffusion Pump.
Set at 390º F, 199º C.
For location of the upper thermal switch see figure #9 (diagram exploded view & parts illustration) below.