Kupeta cartridge sefa
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PP kupeta katuriji sefa imba
Iyo inoumbwa nesimbi isina tsvina yeimba uye sefa cartridge zvikamu zviviri, mvura kana gasi inoyerera kuburikidza nesefa katuriji kubva kunze kuenda mukati, tsvina zvidimbu zvakavharirwa kunze kwesefa cartridge, uye sefa yepakati inoyerera ichibva pakati pekaturiji, kuitira kuti uwane chinangwa chekusefa nekucheneswa.