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Old-style hydraulic piston. This low pressure piston (the "Biscuit") does not include the rings/seals.
Seal kits needed are #302007-1 for 60,000psi; 302007-2 for 40,000kpsi low pressure seal kit.
Upgrade Version The upgrade version, the H2O Jet Hi-Load piston has 3 bands for greater stability, longer performance. See 301023-x for size options.
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