EMA Jiggler Super Siphon Head is to use with your own 1/2″ diameter hose to create your own jiggle or simple safety siphon. Built in glass marble ball inside the tough brass casing, unlike others that use a plastic ball that breaks down or becomes sticky over time. No more need to suck liquids through your transfer hose and run the risk of getting the liquid in your mouth. Great for any application which need to transfer fuel and water.