Piston head, CNC metal, with bearing, Dual Ring, SHSCNC metal piston head Dual Ring with High Flow holes, double o-rings and bearings from SHS (ref. PPS). Precise tight metal head resistant to strong impact. Low weight warrants the smooth running of a large number of precisely spaced holes with High Flow for the impact surface optimally enhance performance. The second o-ring (thinner) has no tightening function, but only the center head with a piston in a cylinder.
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