Iphedi yesilinda, eyaziwa ngokuba yi-cylinder liner, ifumaneka phakathi kwentloko yesilinda kunye nebhloko yesilinda. Umsebenzi wayo kukugcwalisa ii-microscopic pores phakathi kwentloko yesilinda kunye nentloko yesilinda, ukuqinisekisa ukuvalwa kakuhle kumphezulu odibeneyo, uze uqinisekise ukuvalwa kwegumbi lokutsha, ukuthintela ukuvuza komoya kunye nokuvuza kwamanzi kwijakethi yamanzi. Ngokwezixhobo ezahlukeneyo, ii-cylinder gaskets zinokwahlulwa zibe zii-metal - asbestos gaskets, i-metal - composite gaskets kunye nazo zonke ii-metal gaskets. Iphedi yesilinda sisitywino phakathi komphezulu womzimba kunye nomzantsi wentloko yesilinda. Indima yayo kukugcina isitywino sesilinda singavuzi, ukugcina isipholile kunye neoyile iphuma emzimbeni ukuya entloko yesilinda ingavuzi. Iphedi yesilinda ithwala uxinzelelo olubangelwa kukuqinisa i-bolt yentloko yesilinda, kwaye iphantsi kobushushu obuphezulu kunye noxinzelelo oluphezulu lwegesi yokutsha kwi-cylinder, kunye nokugqwala kweoyile kunye nesipholileyo.
I-gaspad mayibe namandla aneleyo kwaye mayimelane nolonwabo, ubushushu kunye nokugqwala. Ukongeza, kufuneka ubungakanani obuthile bokuthamba ukuze kulungiswe uburhabaxa kunye nokungalingani komphezulu womzimba kunye nomphezulu ongezantsi wentloko yesilinda, kunye nokuguquka kwentloko yesilinda xa injini isebenza.
