Safe, infinitely adjustable and incredibly strong ensuring the correct pressure for you flasks. Designed for daily use, with a fully adjustable working pressure up to 6 tonnes - for the correct pressing of 1-3 flasks. The WW-33 is incredibly efficient, featuring a valve which can be opened to allow the piston to return to its starting position automatically. The oxidation free piston is made of super strong material as is the indestructable design in drawn steel. Also features high stability and integrated oil level display. 200mm x 158mm (295mm including pump lever).