The locking nut secures the tube connection so suction stays consistent while extracting or refilling fluid from the engine bay.
DURATECH 500CC Fluid Extractor, Oil Extractor with Long Hose and 500cc
WORKPRO 500CC Fluid Extractor Oil Extractor Long Hose Brake Fluid Extractor NEW
DURATECH 500CC Fluid Extractor Oil Extractor Long Hose Brake Fluid Extractor NEW
DURATECH 500CC Fluid Extractor Oil Extractor Long Hose Brake Fluid Suction Pumps