Resin Guard is an in-line safety device that protects your wire EDM machine from a resin tank leak. The screen prevents resin from entering your machine and never needs to be replaced. It a resin leak occurs simply disconnect and replace your tank, clean out the Resin guard, and you will have saved hours of machine maintenance. A low cost investment to eliminate down-time. Please confirm your hose diameter 1/2″ or 3/4″ when ordering.