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To form a better air seal for the gearbox such as the piston head and the cylinder head. Having a good seal is a must to squeeze all the FPS out from your blaster. At the same time you do not want an O-ring that is way too thick for the piston head, that will actually reduce the FPS because of the increased unnecessary friction.

Replacement O-Rings for your gearbox.In a set of : 1x 19*1.5 and 1x 19*2.4..
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