Agilent Varian HS-20 Oil Drain Plug, Diffusion Vacuum Pump Replacement Parts
Agilent Varian Part Number PN 77261001
This is a replacement Oil Drain Plug. Fits the Agilent Varian HS-20 Diffusion Pump.
For location of the oil drain plug see figure #7 (diagram exploded view & parts illustration) below.