... exhaust mechanism without air lock 3.api ce With GS,CE certificate Non-toxic,environmental-friendly material Customized design ... ,API strictlywe can produce many kinds OF ball float steam trapNote: ball float Steam trap as for the difference working ... available valve typeSteam trapas per pass way typeSteam type, Ball float, Free-ball float steam, Bellows seal steamDesign & Manufacture standardsAPI6D, ...