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The one-piece step gap design of the C&A ZGTF (Zero Gap Taper Face) Piston Ring eliminates forever any possible end gap alignment leakage. The ZGTF Ring made from ductile iron incorporates a two-degree outside taper which acts like a precision squeegee, wiping the cylinder wall clean of excess oil, eliminating possible combustion contamination which can lead to detonation! Cylinder friction is reduced while all conformability is increased.