Topa air gun charging is made of brass, which is more resistant to corrosion, high temperature, ductility, and non-magnetic. One end of it is a 1/4″ OD flared connection, and the other end is a 1/8″npt male connection. Brass tube connecting tube, brass, plastic and aluminum, etc., can be used with horn tube. Very suitable for water, gasoline, oil, vacuum and air pipelines.