These multi-stage systems combine a Stokes Microvac rotary piston pump (paga 3) with a vacuum blower. They automatically and economically evacuate large ayatems. Equipped with all neces-sary switches and cintrols for automatic or manual operation, the maintain con-stant low pressure even against high gas flow.

Customized multi-stage systems are also available to meet your speciflc needs. Features

.Low ultimate blank-off down to 0.1 micron Hg

.Unique oil purification system

.High efficiwncy (80%+)even in the low-micron range

.Automatic operarion from atmos-pheric pressure to bland-off

.Simple design eliminating complex bypass arrangements

.Mnay models abailable with integral by-pass

.Low, simplified maintenance fewer moving parts, less-frequwnt oil chenges
　 then other pumps; no special tools for routine maintenance

.Exclusive Two-Year Limited Warranty