In an effort to provide cost effective alternative to our customers, Airvac has now begun to offer its own line boil-in replacement of Nash 904 series Vacuum Pumps.  Standard construction is an All-Iron Vacuum Pump. We can also supply All-Iron Vacuum Pump with stainless steel cones or fully stainless steel pump. Fully or partial stainless steel pumps offer bolt-in replacement and feature the reliability and durability of  stainless steel.  The Stainless Steel prevents erosive and corrosive wear at the critical seal areas.  This maintains the original close tolerances between the rotor and cones much longer than cast iron parts can.