Tri-Rotor has been a manufacturer of positive displacement rotary piston pumps for over 80 years. Rotary pumps come ranges of up to 20 GPM to 220 GPM. The 30 GPM models can either be foot mounted or close coupled.

United Vacuum is a manufacturer of vacuum pumps and a remanufacturer of rotary piston pumps. Their rotary vane vacuum pumps are remanufactured to meet or exceed OEM specifications. Brands include Alcatel, Edwards, Welch and Leybold.