Agilent Varian HS-20 and HS16 Upper Thermal Switch, Diffusion Vacuum Pump Replacement Parts
Agilent Varian Part Number PN K9050001
This is a replacement upper thermal (water) switch. Fits the Agilent Varian HS-20/16 Diffusion Pump.
Set at 185º F, 85º C.
For location of the upper thermal switch see figure #8 (diagram exploded view & parts illustration) below.