Open end or dr ain hole at the correct position and size If no lug is possible opposite holeing will be required for jigging Center hole dr ainage is not recommended ZINC Zinc run Residual zinc Suggested design for flanged hollow sections A Optional hole position Preferred filldr ain hole position B V ent hole Filldr ain hole C V ent hole D Optional hole position Preferred vent hole position E Open end fulldr ain facility V ent hole prevents air tr aps and resulting ungalv anized internal areas or even floatation Larger opening for faster flow of zinc into unit VENT HOLE CORRECT AIR Incorrect vent hole AIR T r apped zinc sloshes out and runs solidify during cooling causing heavy unsightly buildup from incorectly positioned hole Zinc Correct dr ain hole 23