Agilent Varian Thermal Switch for VHS-4, 6,10, 250, & 400 Diffusion Pumps PN 642906025 This is the Agilent Varian VHS-4, VHS-6, VHS-10, VHS-250, VHS-400 Diffusion Pump replacement Thermal Switch. (Set at 300º F, 148º C). See No. 15 below in illustration for thermal switch location on a VHS-4

Agilent Varian VHS-250, Diffusion Pump Thermal Switch Kit. Agilent Varian PN L8912301 This is a Thermal Switch Kit. Fits the Agilent Varian VHS-250 Diffusion Pump. For location of the baffle retaining ring see item #7 on (diagram exploded view & parts illustration) below. This Thermal Switch Kit includes: Thermal Switch Lug Wire Box Insulator

Agilent Varian VHS-250 Diffusion Pump Heater Wire, 10 AWG, 36 inch length. PN X3901-68002 This is the Agilent Varian VHS-250 Diffusion Pump stranded nickel heater wire, 10 AWG, 36 inches long. (3 - 36 inch lengths required for total replacement per pump). See No. 9 below in illustration for heater wire location.

Agilent Varian VHS-250, Diffusion Pump Baffle Retaining Ring. Agilent Varian PN 699992187 This is a replacement baffle retaining ring. Fits the Agilent Varian VHS-250 Diffusion Pump. For location of the baffle retaining ring see item #6 on (diagram exploded view & parts illustration) below.

Agilent Varian VHS-250 Diffusion Pump O-Ring Kit. Agient Varian PN K0377184 This is the Agilent Varian VHS-250 Diffusion Pump O-Ring Kit. O-Ring Kit Contains: 3 Butyl inlet flange O-ring, Parker No. 2-267 3-Butyl-N foreline flange O-ring, Parker No. 2-332 10 Viton fill and drain O-rings (old style), Parker No. 2-112 10 Viton fill and drain O-rings (new style, Parker No. 2-113 1 PTFE gasket 1 Sight glass O-ring, Parker No. 2-226

Agilent Varian VHS-250 Air Cooled Diffusion Pump Replacement Standoff Ceramic Bushing Insulator, for Cold Cap.Agilent Varian PN 699006025 Agilent Varian VHS-250 Air Cooled Diffusion Pump Replacement Standoff Ceramic Bushing Insulator, for Cold Cap. For location see item #19 on illustration below.

Agilent Varian VHS-250 Diffusion Pump Lugs for Heater Wire, 1 each. Varian Agilnet PN 648056680 This is the Agilent Varian VHS-250 diffusion pump heater wire lugs, (sold as one each.) See No. 10 below in illustration for heater wire lugs location.

Agilent Varian VHS-250, Diffusion Pump Sight Glass Kit Replacement Part. Agilent Varian PN L8908301 This is a replacement Sight Glass Kit. Fits the Agilent Varian VHS-250 Diffusion Pump. For location of the sight glass kit see item #2 on (diagram exploded view & parts illustration) below.

Agilent Varian VHS-6 Diffusion Pump Replacement Heater, StoveTop Style, 120VAC, 2200W, 18.3A, 6.6OhmsAgilent Varian Part Number 647306125 These Agilent Varian VHS-6 & VHS-250 heaters are OEM Agilent Varian replacement parts for the VHS-6 diffusion vacuum pumps with part number 647306125. These replacement diffusion pump heaters are designed to operate on 120 VAC producing 2200 watt of heat for a VHS-6, VHS-250 diffusion pump. These heater element pull 18.3 Amps at 120 VAC and have a 6.6 Ohms resistance across the element. These Agilent Varian VHS-6 heaters are shown as #8 in the illustration below.

Agilent Varian VHS-6 & VHS-250 Diffusion Pump Replacement Heater, 208VAC, 2200W, 10.6A, 19.6 OhmsAgilent Varian Part Number 647306175 These Agilent Varian VHS-6 & VHS-250 heaters are OEM Agilent Varian replacement parts for the VHS-6 diffusion vacuum pumps with part number 647306175. These replacement diffusion pump heaters are designed to operate on 120 VAC producing 2200 watt of heat for a VHS-6, VHS-250 diffusion pump. These heater element pull 10.6 Amps at 208 VAC and have a 19.6 Ohms resistance across the element. These Agilent Varian VHS-6 heaters are shown as #8 in the illustration below.

Agilent Varian VHS-6 & VHS-250 Diffusion Pump Replacement Heater, 240VAC, 2200W, 9.2A, 26 Ohms Agilent Varian Part Number 647306225 These Agilent Varian VHS-6 & VHS-250 heaters are OEM Agilent Varian replacement parts for the VHS-6 diffusion vacuum pumps with part number 647306225. These replacement diffusion pump heaters are designed to operate on 120 VAC producing 2200 watt of heat for a VHS-6 & VHS-250 diffusion pump. These heater elements pull 9.2 Amps at 208 VAC and have a 26 Ohms resistance across the element. These Agilent Varian VHS-6 heaters are shown as #8 in the illustration below.

Agilent Varian VHS-6 & VHS-250 Diffusion Pump Heater Clamp Assembly. Agilent Varian Part Number 86643301 These Agilent Varian VHS-6 & VHS-250 diffusion pump heater clamp assemblies are OEM Agilent Varian replacement parts with part number 86643301. These clampling plates help transfer heat from the diffusion pump heater to the oil inside the pump. these clamping plate kits include: clamping plate, cover plate, and insulator, see #11 abc below in the illustration below.

Agilent Varian VHS-250 Diffusion Pump Heater Cover. PN L8997001 This is the Agilent Varian VHS-250 diffusion pump heater cover. See No. 13 below in illustration for pump heater cover location.

Agilent Varian Bolts to Attach ASA Gate Valves to ASA Diffusion Pumps 3/4-10 1-1/4" Length Hex Bolt - Course Thread, 1 each. These are bolts to attach ASA Gate Valves to ASA Diffusion pumps, ASA sizes 6, 8 and 10 inch. One each, size 3/4-10 1-1/4" Length Hex Bolt - Course Thread.

Varian VHS-250 Old-Style Diffusion Pump Thermal Overload Switch Aluminum Cover Box These Varian VHS-250 diffusion vacuum pump replacement thermal overload switch covers are made of aluminum. They also include the replacement mounting hardware. The thermal switch is used to protect the diffusion pump from over heating which typically occurs from lack of cooling water.