I-Piston Ring (Piston Ring) isetshenziselwa ukushumeka i-piston groove ngaphakathi kwendandatho yensimbi, indandatho yepiston ihlukaniswe izinhlobo ezimbili: indandatho yokucindezela kanye nendandatho kawoyela. Indandatho yokucindezela ingasetshenziswa ukuvala igesi yengxube evuthayo ekamelweni elivuthayo; Indandatho kawoyela isetshenziselwa ukukhuhla uwoyela oweqile kusilinda.
Indandatho ye-piston iwuhlobo lwendandatho yensimbi enwebekayo ene-deformation enkulu yangaphandle, ehlanganiswe kuphrofayili kanye ne-groove yayo ehambisanayo. Izindandatho zepiston eziphindaphindayo nezizungezayo zincike emehlukweni wengcindezi yegesi noma uketshezi ukuze akhe uphawu phakathi kwendilinga yangaphandle yeringi nesilinda nohlangothi olulodwa lweringi kanye negroove yeringi.