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 baya-bayan nan, 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.