The EM range of oil-sealed rotary pumps - renowned for its high Ultimate vacuum, rapid pumping speed, quiet operation and ability to handle vapor - has become the industry standard Laboratory and light industrial applications. The E2M28 pump is a two-stage, direct drive, sliding vane pump. The pump is oil sealed and designed for reliable, long-term operation in both Laboratory and industrial environments. The pump is a freestanding unit with the drive provided through a flexible coupling by either a single-phase or three-phase (four-pole) motor. Free Kf25 flexible Stainless steel bellow (3.3 ft), clamps and centering Rings set ($219 value) included. Supplied with: one 3-ft Kf25 flexible Stainless steel bellow, two bottles of Ultra grade 19 oil, two set of new/Kf25 clamps & centering ring, power cord and instruction CD. Features and benefits * the pump is designed for reliable, long-term operation. * thermal overload device prevents overheating (single phase only). * the pump is a free-standing unit. * the drive is provided through a flexible coupling by a single-phase or three-phase (four pole) motor. * the motors are totally enclosed and are cooled by the motor-cooling fan. * easy to use controls. * pressure die cast oil box with integral oil seals prevents oil leaks. * gas ballast Valve for large water vapor handling capacity. * externally approved to EN61010, CSA, C22.2 and UL61010. * oil distribution Valve. * pumping Chambers are air-tight. * oil sight-glass, two oil drain-plugs, inlet-port and Outlet nozzle all fitted as standard. * gas-ballast control.