Saina polo valve lelei auiliiliga: fausaga faigofie, faamaufaailoga lelei ma isi
Suʻesuʻega lelei a le polo a Saina: fausaga faigofie, faʻamaufaʻailoga lelei ma isi mea faʻapipiʻi Ball valve o se mea e masani ona faʻaogaina ai le vai, o lona fausaga faigofie, faʻamaufaʻailoga lelei ma isi mea lelei e faʻaaogaina lautele i le suauu, vailaʻau, metallurgy, eletise eletise ...
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