I loko o ka ʻoihana hoʻokele kahe o kēia wā, ʻoi aku ka kaulana o nā pahu wafer check ma muli o kā lākou hoʻolālā paʻa, maʻalahi o ka hoʻonohonoho ʻana a me nā kumukūʻai hoʻomaka a me ka mālama ʻana i hoʻohālikelike ʻia me nā loiloi flanged swing maʻamau.Hāʻawi ʻo BVMC i ka pā hoʻokahi a me ka pālua ʻelua papa wafer check valve me nā mea like ʻole.