Check the listing for details. HP / Agilent PSU Encoder / Knob fits E3631A/E3632A/E3633A, E364xA, 33120A, other. Condition: New. Listed at 13.49 USD. Brand new high quality replacement Rotary Encoder Knob with D-shaft for HP / Agilent / Keysight PSU and Function Generators Fits the following HP / Agilent Power Supplies: E3631A, E3632A, E3633A, E3634AE3640A, E3641A, E3642A, E3643A, E3644A, E3645A, E3646A, E3647A, E3648A, E3649A 6611C, 6612C, 6613C, 6614C, 66309B, 66309D, 66311A, 66311B, 66319B, 66319D, 66321B, 66321D 66111A, U8001A, U8002A Also fits to HP / Agilent 33120A, certain 33210A, certain 33220A, certain 33250A Function / Arbitrary Waveform Generators and E4401B, E4402B, E4403B, E4404B, E4405B, E4407B, E4407S, E4408B, E4411A, E4411B, E4440A, E5501A, E5501B, E5502B, E5503A, E5503B, E5504A, E5504B, E7401A, E7402A, E7403A, E7404A, E7405A, 84105EM Spectrum AnalyzersIncludes:Rotary EncoderWasherNut HP / Agilent part numbers: 0960-0892, 0960-2545 Let me know if you need a mail in replacement service for your unit and I'll send you additional quote. I also have in-stock Front sense short links for E3632A, E3633A, E3634A PSUsand rear plastic panel for E3631A, E3632A, E3633A, E3634A PSUs