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The Mahle plain ring set (PC479) is an OE-style piston ring kit with a 4.7550" diameter and a .0857" specification, including the noted second ring dimension (.170 RW) in the set description. Intended as a direct-replacement piston ring set for compatible engines, it provides the required plain ring profile and sizing for rebuilds or repairs where these dimensions match the engine's piston geometry.
Mahle Rings 4.7550 x .0857 PC479 THG 2nd Ring .170 RW Plain Ring Set
