Brass Bibcock ndi mtundu wa valavu ya mpira wamkuwa, yopangidwa ndi mkuwa wonyengedwa komanso wogwiritsidwa ntchito ndi chogwirira, chomwe chimatchedwanso matepi amkuwa amkuwa, omwe amagwiritsidwa ntchito kwambiri popanga mapaipi, kutentha, ndi mapaipi.