The DeWALT 5140235-94 Air Compressor Pump helps restore reliable air compression and consistent performance for compatible DeWALT air compressors. It works by drawing in atmospheric air, compressing it, and delivering pressurized air to the storage tank for powering pneumatic tools and equipment. Made to replace a worn, damaged, or inefficient pump, it helps restore proper airflow, im... https://www.wholetoolbox.com/dewalt-5140235-94-air-compressor-pump/5140235-94.html