Air/Hydraulic HYDRAULIC FOOT PUMPS BETEX AP SERIES Features: Rugged construction: most components are made of aluminum alloy and are built for long service life, easy operation and portability. Automatic 10,000 psi overload-relief valve protects components in hydraulic systems and ensures safe operation. New inlet/outlet design features slow deflation function, which reduces noise, and allows multidirectional operation. Oil capacity can be modified according to your specific application.