With modular cartridge design, gas-lubricated Series 7800 supports contacting dry or wet, non-contacting, or combination of non- and dry-contacting seal technology, without change of adaptive hardware. Type 7828G noncontacting, gas lubricated double seal uses dry nitrogen as barrier gas and spiral groove technology to separate primary seal faces. Hybrid 7828GD offers combination of noncontacting seal faces inboard and dry-contacting faces outboard.