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EC240 EC290 D7D Set of piston rings 21299547 20793531
The D7D Set of piston rings 21299547 piston ring has a metal elastic ring with a large outward expansion deformation, which is assembled into an annular groove corresponding to its cross section. Reciprocating and rotating piston rings rely on the pressure difference of gas or liquid to form a seal between the outer circular surface of the ring and the cylinder and one side of the ring and the ring groove.
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