Diaphragm Vacuum Pumps (Oil-Free)

Diaphragm vacuum pumps are a highly popular subset of laboratory pumps. With their oil-free design and cost-effective construction, diaphragm pumps are manufactured in an array of styles and with a bevy of optional features, including multiple pump stages, solvent recovery, and desired free air displacement.

Despite the many choices available, all diaphragm pumps share a few key benefits: they're low-hassle units (thanks to their oil-free design), they're chemically resistant (thanks to insulated PTFE components), and they're versatile across a wide range of pressures and temperatures.

Used often for chemical duty -- especially rotary evaporation -- diaphragm pumps are available from several well-regarded brands, including Welch, VacuuBrand, and Pilot.