... , Two-stage ejector, Air poppet valves 2)locating elements:Straight side interlocks, X-style Straight slide interlocks, Square interlock,Tapered interlocks, Taper pin ... ,lock plate, parting locks 4)cooling elements:Spiral plug baffles ,Straight plugbaffles ,Threadless pressure plugs,Jiffy Connectors, Pipe plugs,Heat pipe ...