PRODUCT FEATURES ?Flow-enhanced design meets compressed air/vacuum demand ?Ultra quiet noise level down to 45 dBA ?Easy-install design can be mounted on any plane ?Oversized ball bearings ensure maintenance-free operation......PRODUCT FEATURES ?Flow-enhanced design meets compressed air/vacuum demand ?Ultra quiet noise level down to 45 dBA ?Easy-install design can be mounted on any plane ?Oversized ball bearings ensure maintenance-free operation ?Robust valve design tolerant of small amounts of intake liquid ?Field serviceable diaphragm/valve designs: K813 (EDPM), K813A (Neoprene)