Contains wide Gap Rings. Use only on Valve Cover Breathers. Replace only in complete sets.Includes:• (1) HC1810504 Cylinder Sleeve• (1) HC1817520 Piston• (1) HC1817247 Piston Ring Set• (1) HC680086 O-Ring KitThe HC1817645 Cylinder Kit, Wide Gap Rings fits equipment brands such as: Case IH, IH/Navistar Engine, InternationalThe HC1817645 is a substitute for the following discontinued products: HCR71817646