Iiflethi zentsimbi ezingama-304 ziyindlela yokudibanisa imibhobho, i-valves, iimpompo kunye nezinye izixhobo zokwenza inkqubo yokufaka. Ikwasebenza nokucoca, ukuhlola okanye ukulungiswa. Iiflethi zihlala zidliwe okanye ziqinile. Amalungu eFlanji yenziwa ngokuxhoma iiflethi ezimbini kunye ne-gasket phakathi kwabo ukubonelela ngetywina.