Brass Swing Check Valvean yi shi da jabun tagulla, wanda kuma ake kira bawul ɗin da ba zai dawo ba, an ƙera shi don sarrafa tsarin sarrafa ruwa na koma baya, ruwan ana sarrafa shi ta diski mai motsi kuma yana gudana ta hanya ɗaya, ana amfani da shi sosai don aikin famfo, famfo, da bututun mai.