These are very large durable "piston" style pumps made
for big volume vacuum production. They are used to evacuate very large
spaces on a production basis. They are extremely tough, have low
rotational speeds and large oil sump capacities. The simplicity of design
means they are typified by years of trouble free service. We import
these, they are high quality and the lead times
are about 6-8 weeks. The price is right.