Self-Closing Funnels, 18-Ga. Steel, 10-3/4 In Mouth. The Funnel Ft S Hinged Covers Reduce The Spread Of Hazardous Vapors. Flame-Arresting Brass Tube Fits Standard 2 In Bung. In Case Of Ignition, Fusible Link Melts At 165F And Snaps Lid Closed, Has A 32 In Standard Flame-Arresting Tube.