ʻO kaʻO ka wafer pāpaʻi pālua ʻeluaʻO ia ka pahu hoʻihoʻi ʻole kumu a pau i ʻoi aku ka ikaika, ʻoi aku ka maʻalahi o ke kaumaha a ʻoi aku ka liʻiliʻi o ka nui i hoʻohālikelike ʻia me ka valve swing check valve a i ʻole life check valve.ithoʻohana i ʻelua ʻāpana i hoʻopiha ʻia i ka puna i hoʻopaʻa ʻia ma kahi pine hinge waena.I ka emi ana o ke kahe, pili na papa e ka torsion spring action me ke koi ole i ka hoohuli.Hoʻohui pū ʻia nā hiʻohiʻona a pau i ka Dual Plate Check Valve kekahi o ka hoʻolālā maikaʻi loa.

aia iā mākouʻO ka wafer pāpaʻi pālua ʻeluame ka hana hoʻopaʻa nani, akā no ka haʻahaʻa haʻahaʻa a me ka mahana maʻamau, no ka palena o nā hiʻohiʻona rubbers.