DuoSeal rotary vane vacuum pumps are proven performers with low pump RPM to ensure long service life with durable precision machined steel rotor, cast iron intake, exhaust ring and metal vanes. DuoSeal models are used on the most demanding service applications such as purge pump on absorption chillers and Industrial/commercial chillers. CRVpro models of rotary vane vacuum pumps are portable but powerful and come with forced oil lubrication and a protective coating on key internal parts. CRVpro pumps are used where high flow is required, and a lightweight and small footprint is desired for service applications such as rooftop HVAC equipment and RTUs.