Description Heavy duty cast iron top and aluminum base.-cast iron top and base available. Machined top and base with a Buna-N “O” Ring provide a vapor resistant seal. Air flow at 2.5psi is 43,770 SCFH with screen. The screen minimizes the chances of vandalism and theft. 3″ NPT male threads are standard. Recommended Accessories: AST Overfill Prevention Valve AST Spill Containment Box PEI Free Flow Vents AST Audible Alarm AST Sight Gauge
