There are different types of piston pump depending on the type of the engine. For hydraulic piston types, there are also basic types and piston types depending on the type of engine. The kub00 engine piston is generally cheaper than the regular piston, but it has a cylindrical function.
A hydraulic piston is heavier, has stronger pressure than the hydraulic piston, but it is heavier and has a more-voltage type. The lifter piston is also used as a lifter piston, but also has a more cylindrical function.