Mndandanda wa APU ndi payipi ya mpweya wa pneumatic polyurethane yomwe imagwiritsidwa ntchito kwambiri m'mafakitale osiyanasiyana.
Pneumatic polyurethane air hose ili ndi izi. Choyamba, amapangidwa ndi zinthu zapamwamba kwambiri za polyurethane, zomwe zimakhala ndi kukana kovala bwino komanso kukana dzimbiri, ndipo zimatha kugwiritsidwa ntchito kwa nthawi yayitali m'malo ovuta. Kachiwiri, ili ndi kusungunuka bwino ndi mphamvu, imatha kupirira kuthamanga kwambiri komanso kutentha kwambiri, kuonetsetsa chitetezo ndi kukhazikika kwa ntchito. Kuphatikiza apo, payipi imakhalanso ndi kukana kwamafuta abwino komanso kukana kwamankhwala, oyenera pazinthu zosiyanasiyana zamafakitale.