NES is one of the very few companies who has the capability to build new AT two stage liquid ring vacuum pumps. This NAT-3004 was recently built for the power industry in the US. NES has the capability to build NAT-1004, NAT-2004, and NAT-3004 in cast iron or stainless steel. These pump are brand new drop-in replacements for the classic AT series. The NAT series is available as bare pumps, parts, or engineered systems including exhauster condenser packages.