Bawul ɗin cika bayan gida mai ƙaramin Pilot yana da farantin matsi a ciki wanda ke da sauƙin kamuwa da matsin ruwa. Lokacin da matakin ruwan ya kai matakin rufewa, farantin matsi yana haifar da ƙarfi don rufe ramin shiga, yana kammala aikin rufewa.
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