The Welch CRVpro family of two stage rotary vane vacuum pumps are built to last with increased reliability and longer service interval than comparable pumps on the market. These pumps run 10% cooler, use 36% less oil and have a 40% larger oil capacity to further dilute any harmful vapors that are not condensed in the cold trap. Features include a gas ballast, low noise level, forced oil lubrication and an anti-suck back valve. CE & cULus rated.