Patented screw press technology, without nonreturning alve inside that is usually used on troublesome hand pumps.
Easy-to-use
With the patented screw press technology, high pressures can be generated easily, as well as increased and decreased smoothly.
Extremely Low Leakage
Patented screw press technology replaces troublesome, check valves (non-returning valve) found in most hand pumps which practically eliminates leakage.
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