Threaded brass and bronze fittings connect with pipe to transport air, drinking water, flammable gases, slurries, and chemicals in residential and industrial plumbing applications. Threaded pipe fittings are threaded on both connection ends. Female threads are on the inside of a fitting. Male threads are on the outside of a fitting and screw into the female threads. Threaded connections include NPT (National Pipe Thread) or BSPT (British Standard Pipe Taper), and use PTFE tape to secure seal. Brass, an alloy of copper and zinc, is strong, highly conductive, maintains machineability at high temperatures, and resists corrosion from water, heat, acids, minerals, and peaty soils. Brass, a bright gold color, is compatible with stainless steel, copper, or zinc piping. Bronze, also known as red brass, is a metal alloy of copper and tin. Bronze resists corrosion from saltwater and has higher heat and electric conductivity than most metals.