From€190excl. VAT
In stock
Can't find what you're looking for?
VWR / KNF PM20405-86 diaphragm vacuum pump with 6 L/min flow, 100 mbar ultimate vacuum, oil-free operation and 230 V supply.
The VWR / KNF PM20405-86 diaphragm vacuum pump supplies oil-free vacuum for laboratory applications including vacuum filtration, solvent or buffer degassing, gas sampling, desiccators and analytical instrument support. It is also used for biotechnology and life sciences laboratory vacuum tasks.
The unit provides approximately 6 L/min flow and an ultimate vacuum of approximately 100 mbar absolute. Its oil-free diaphragm design prevents oil contact with samples and avoids backstreaming.
The pump is used and has a 1.9 kg weight, 230 V / 50 Hz supply and IP20 protection class. The motor is described as maintenance-free.
The VWR / KNF PM20405-86 is a compact diaphragm vacuum pump for laboratory vacuum filtration, degassing, gas transfer, gas sampling and desiccator applications. It also supports vacuum supply for analytical instruments and other small laboratory tasks.
The pump operates without oil, which prevents oil contamination and backstreaming. Its housing is resistant and easy to clean. The motor is maintenance-free, and operation is described as quiet for use in teaching laboratories and shared spaces.
This unit is used and weighs approximately 1.9 kg. It has a compact footprint for bench-mounted laboratory use.
The approximately 6 L/min pumping speed supports small vacuum tasks such as filtration, degassing, gas transfer and gas sampling. The approximately 100 mbar absolute ultimate vacuum places the pump in the range described for these routine applications rather than high-vacuum work.
The oil-free diaphragm technology prevents oil contamination and backstreaming into the connected laboratory setup. This configuration suits applications where the pumped gas or sample environment must remain free of pump oil.
Lab equipment markets are fragmented. Buyers spend weeks calling distributors, comparing quotes, and verifying supplier reliability. Sellers struggle to reach global research labs.
We built Questpair to fix this. Every supplier on the platform is verified before listing. Every quote you receive comes from a real, vetted seller. AI prepares your case in minutes, then a real specialist takes over.
We're an independent team based in The Netherlands, working with research labs and procurement teams across Europe and worldwide.
With a service contract, ten to fifteen years is normal for most benchtop instruments. Detectors and pumps are the parts that wear first.
Often, yes. Verified suppliers frequently work with service partners converting the instrument. If applicable, we can list servicing options alongside the offer.
Ask a scientist through the request button. Parts are often available even when the instrument itself is discontinued.
Two to six weeks, depending on refurbishment scope and whether calibration is included.
We ship to 38 countries. Crating and customs handling are quoted with the instrument.
Tell us what you need and a scientist finds it for you, usually within the hour.
Last updated 5 November 2026
€190 sits below most vacuum pumps here. The middle half of the 420 with a price runs from €396 to €2,469.
