ʻO ka pahu kaʻa kaʻa pōpō hoʻokahi me 3 mau awa no ka paipu laina laina: i ka wā o nā awa V1 aHoʻopili ʻia ʻo V2 i nā laina hana 2, hāʻawi ka valve i ka mea kiʻekiʻe loa o nā kaomi 2i ke awa maʻamau C. ʻO ka pōpō hoʻokahi e hiki ai i ka palaho o ka hōʻailona kaomike hāʻule nā ​​awa hana ʻelua i kahi pae kaomi haʻahaʻa.