Makina ochapira mphira ndi mtundu wa gasket wa rabara womwe umakhala wosalala, wozungulira, ndipo uli ndi bowo pakati.Amapangidwa kuti azitha kuwongolera ndikuletsa kutayikira pakati pa malo awiri, monga mtedza, mabawuti, kapena zomangira.Makina ochapira mphira amagwiritsidwa ntchito kwambiri popanga mapaipi, magalimoto, ndi makina opangira.Nthawi zambiri amapangidwa kuchokera ku zipangizo monga neoprene, silicone, kapena mphira wa EPDM, zomwe zimakhala zosinthika, zosakanizika, komanso zimakhala ndi mankhwala abwino.Makina ochapira mphira atha kuthandizanso kuchepetsa kugwedezeka ndi phokoso, kukonza kusindikiza, komanso kupewa kuwonongeka kwa malo.Zimabwera mosiyanasiyana ndi makulidwe kuti zigwirizane ndi ma diameter osiyanasiyana a bawuti ndi ntchito.