Swivel vapor adapter for use in dual point fill systems on the vapor return line. Brass construction. Buna-N gasket for positive seating on standard riser pipesExternal lugs on the adapter body for easy installation. 4" cam and groove. The swivel feature prevents accidental loosening of threads. Incorporates a locking system of two set screws located 90 degrees apart. These screws are tightened onto the riser pipe threads after the adapter is properly torqued in place, preventing the hose torque from the product fill process from affecting the seal of the adapter to the riser pipe. The dual Viton o-rings are field replaceable.