This cylinder piston kit is compatible with RY30004, RY30004A, RY30002, RY30002A, RY30021A, RY30041A, RY30061A, RY52003A, TP30, RY52001, PC30, and RY52003 models.It is designed specifically for 30cc engines and is not compatible with 25cc, 26cc, or 31cc models.The kit includes one cylinder, one piston kit, one cylinder gasket, and one intake gasket.Made from metal components, it supports performance at operating temperatures up to 105°C.Installation instructions are included for straightforward setup.This replacement assembly helps restore operational efficiency in string applications.