Current Inventory · Real Pricing · Varian · CVC · Pumps · Pump Stacks
Diffusion Pumps for Sale & Rental
Shop YTI’s current inventory of Varian and CVC high-vacuum diffusion pumps and complete pump stacks with real purchase pricing shown directly on the page. Compare models, availability and configurations, ask about qualifying rentals, or send YTI an existing pump for refurbishment.
Varian
HS-35 Diffusion Pump
Large High-Vacuum Diffusion Pump
Large industrial HS-35 for high-throughput coating, furnace, processing and production applications.
Availability
Varian
HS-20 Diffusion Pump
20-Inch High-Vacuum Diffusion Pump
Varian HS-20 with heater and paint customization options for replacement and production applications.
Availability
Varian
HS-6 Diffusion Pump
6-Inch High-Vacuum Diffusion Pump
Compact Varian diffusion pump for replacement, spare-equipment, coating, laboratory and process applications.
Availability
CVC
35" Diffusion Pump
Large Industrial Diffusion Pump
Large CVC 35-inch diffusion pump available after rebuild for high-throughput industrial vacuum applications.
Availability
CVC
6" Diffusion Pump Stack
Complete High-Vacuum Pump Stack
Complete CVC six-inch pump stacks for replacement, integration, spare capacity and production-system projects.
Availability
Varian
HS-35 Pump Stack
Complete Industrial Pump Stack
Complete Varian HS-35 pumping assembly for large industrial high-vacuum replacement and integration applications.
Availability
Don’t see the exact diffusion pump you need?
Send YTI the manufacturer, model, nameplate, inlet size, heater information and photos of the existing pump or vacuum system. YTI can review current inventory, replacement equipment, rental availability, refurbishment and compatible integration paths.
Compare Current Inventory
Diffusion pump prices, availability and equipment options
Compare YTI’s current diffusion-pump inventory in one place. Exact electrical configuration, flange dimensions, included hardware, refurbishment scope and system compatibility should still be confirmed from the physical equipment before installation.
| Equipment | Type | Availability | Purchase Price | Rental | Notes | Details |
|---|---|---|---|---|---|---|
| Varian HS-35 | Large standalone diffusion pump | 1 now + 3 additional approximately 2 weeks | $25,000 | Available | Large high-throughput industrial applications | View → |
| Varian HS-20 | Standalone diffusion pump | 2 immediately available | $18,500 | Available | Heater and paint customization available | View → |
| Varian HS-6 | 6-inch standalone diffusion pump | 2 immediately available | $3,000 | Available | Compact Varian high-vacuum pump | View → |
| CVC 35" | Large standalone diffusion pump | 1 available after rebuild | $18,500 | Inquiry | Rebuild candidate available | View → |
| CVC 6" Stack | Complete pump stack | 6 immediately available | $750 | Not currently listed | Confirm exact stack components | View → |
| Varian HS-35 Stack | Complete pump stack | 1 immediately available | $4,500 | Not currently listed | Complete HS-35 pumping assembly | View → |
Equipment Paths
Buy a diffusion pump, rent temporary equipment or rebuild what you already own
A failed or underperforming diffusion pump does not automatically require buying another pump. YTI can help determine whether replacement, rental coverage or refurbishment makes the most sense for the system and production schedule.
01 · PURCHASE
Buy available equipment
Choose from current standalone diffusion pumps and complete pump stacks with purchase prices shown directly on this page. YTI confirms condition, physical configuration and included hardware before final sale.
Browse current inventory →02 · RENT
Bridge production downtime
Qualifying standalone pumps may be available for temporary rental while customer-owned equipment is being repaired or rebuilt, helping reduce extended production downtime.
Ask about rental availability →03 · REFURBISH
Restore your existing pump
YTI can tear down, clean and inspect the pump, evaluate the internal jet assembly and heaters, replace seals, install appropriate fluid, leak test and verify performance.
View refurbishment service →Diffusion Pump Buying Guide
Do not choose a replacement diffusion pump by throat size alone
Two pumps with similar nominal inlet dimensions may still differ in overall height, flange pattern, foreline position, heater voltage, pumping speed, fluid requirement, cooling needs and integration hardware. The surrounding vacuum system matters just as much as the pump model.
01 · INLET
Chamber connection
Confirm flange diameter, flange standard, bolt pattern, valve interface and available physical clearance.
02 · PUMPING
Required capacity
Chamber volume, process gas load, target pressure and cycle-time requirements influence the correct pumping package.
03 · HEATERS
Electrical configuration
Verify heater wattage, facility voltage, phase, controls, thermal protection and safety interlocks.
04 · COOLING
Water requirements
Pump body, baffle and cold-cap cooling must have reliable flow and temperature control throughout operation.
05 · BACKING
Foreline & backing pump
Diffusion pumps depend on an adequately sized backing stage capable of maintaining the required forepressure.
06 · PROCESS
Fluid & cleanliness
Process sensitivity, pump fluid, baffles, traps and contamination requirements can affect the final configuration.
Equipment Types
Standalone diffusion pump vs complete pump stack
Several listings on this page are standalone diffusion pumps while others are larger pump-stack assemblies. Knowing which one you need can reduce fabrication and integration work during replacement.
Standalone Diffusion Pump
A standalone pump is appropriate when the surrounding high-vacuum valve, baffle, foreline, backing system and controls are already installed and compatible.
- Replacement pump body and internal jet assembly
- Existing system hardware remains in place
- Requires flange and dimensional compatibility
- Electrical and heater requirements must be verified
Complete Pump Stack
A pump stack may include significantly more of the vacuum package, making it useful for equipment rebuilds, system repurposing or replacing multiple aging components together.
- Diffusion pump
- High-vacuum valve or isolation hardware
- Baffle, cold cap or trapping hardware
- Foreline components
- Potential backing equipment and controls
- Support frame and integration hardware
Complete High-Vacuum Package
The diffusion pump is only one part of the pumping system
Poor chamber pressure or slow pump-down can come from the pump itself, but it can also come from restricted conductance, weak backing capacity, cooling problems, contaminated fluid, valves, leaks, gauges or control sequencing.
High-Vacuum Applications
Where diffusion pumps and pump stacks are used
Diffusion-pump systems remain common in applications where dependable high vacuum, substantial pumping capacity and long-term equipment serviceability are important.
Manufacturers
Varian, Agilent and CVC diffusion pump equipment
Current and legacy Varian pump support
YTI’s current inventory includes Varian HS-35, HS-20 and HS-6 pumps along with an HS-35 pump stack. YTI also supports legacy Varian and current Agilent vacuum equipment for service, refurbishment, components and system troubleshooting.
Varian & Agilent support →Consolidated Vacuum Corporation equipment
YTI inventory includes a large CVC 35-inch diffusion pump and complete six-inch pump stacks. Legacy CVC installations can be evaluated as complete pumping systems rather than treating the pump body in isolation.
Ask about CVC equipment →Diffusion Pump Resources
Continue to the page that matches the work you need
Diffusion Pump FAQs
Buying, pricing, renting and replacing diffusion pumps
How much do YTI diffusion pumps cost?
Current purchase prices range from $750 for a CVC 6-inch pump stack to $25,000 for a Varian HS-35 diffusion pump. Current listed prices are HS-35 $25,000, HS-20 $18,500, HS-6 $3,000, CVC 35-inch $18,500, CVC 6-inch pump stack $750 and Varian HS-35 pump stack $4,500. Freight and final configuration are confirmed before sale.
Does YTI sell diffusion pumps?
Yes. YTI maintains inventory of standalone diffusion pumps and complete pump stacks. Current listings include Varian and CVC equipment, with pricing and availability shown above.
What diffusion pumps does YTI currently have available?
Current listings include the Varian HS-35, Varian HS-20, Varian HS-6, CVC 35-inch diffusion pump, CVC six-inch pump stacks and a complete Varian HS-35 pump stack.
Can I rent a diffusion pump from YTI?
Rental is available on qualifying equipment and can be useful when an existing pump is being repaired or refurbished. The standalone HS-35, HS-20 and HS-6 currently include rental options. Contact YTI to confirm availability.
Are all pump stacks available for rental?
No. The current CVC six-inch pump stack and Varian HS-35 pump stack are offered for sale. Rental should not be assumed unless specifically confirmed by YTI.
Can YTI refurbish my existing diffusion pump instead of replacing it?
Yes. YTI can disassemble and clean the pump, inspect the internal jet assembly, evaluate heaters and boiler condition, replace seals and gaskets, install appropriate pump fluid, helium leak test the assembly and verify performance.
What brands of diffusion pumps does YTI support?
YTI supports current and legacy diffusion-pump equipment including Varian, Agilent, CVC, Balzers and Leybold, depending on the exact model and requested work.
Should I buy a replacement pump or rebuild my existing one?
The answer depends on contamination, body condition, jet-stack condition, heaters, required downtime, available replacement equipment, process requirements and the cost of integrating another pump. YTI can evaluate both paths.
What is the difference between a diffusion pump and a pump stack?
A standalone diffusion pump is the high-vacuum pump itself. A pump stack can include the diffusion pump plus valves, baffles or cold caps, foreline hardware, backing equipment, controls, supports and other connected components.
Can I replace one diffusion pump with another pump of the same size?
Not automatically. Nominal inlet diameter does not confirm flange compatibility, overall dimensions, heater requirements, foreline position, pumping speed, fluid requirements, cooling or connected hardware.
What information should I send YTI before buying a pump?
Send the manufacturer, model, serial or nameplate information, photos, inlet and foreline dimensions, heater voltage and wattage if known, backing-pump model, cooling information, process application, target vacuum and required timeline.
Why does the backing pump matter?
A diffusion pump cannot exhaust directly to atmosphere. It depends on a mechanical backing or foreline pump to maintain acceptable outlet pressure. Weak backing performance can make a good diffusion pump appear to be underperforming.
Need a diffusion pump or complete pump stack?
Browse YTI’s priced inventory above or send the current pump model, chamber application, photos and required timeline. YTI can review purchase, rental, refurbishment and replacement options.
