ʻO ka paipu mālamalama pololei
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ʻO ka pololei o loko a me waho o ka paipu hoʻomālamalama
ʻO ka pahu kukui pololei ke ʻano o nā mea kila kiʻekiʻe ma hope o ka hoʻopau ʻana i ke kaha kiʻi a i ʻole ka ʻōwili anu. No ka mea, ʻaʻohe papa oxide ma nā paia o loko a me waho o ka puʻupuʻu māmā pololei, ʻaʻohe leakage ma lalo o ke kaomi kiʻekiʻe, kiʻekiʻe kiʻekiʻe, kiʻekiʻe kiʻekiʻe, ke anu anuanu me ka ʻole o ka deformation, flaring, flattening me ka ʻole o nā māwae a pēlā aku, ua hoʻohana nui ʻia no ka hana ʻana o nā ʻāpana pneumatic a hydraulic.