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O P W a , company Overfill Prevention and Venting Equipment 71SO Testable Overfill Valve The OPW new patent-pending Testable 71 SO -T Overfill Prevention Valve is the easiest, quickest and most cost efficient way to ensure that your overfill valves will operate when called upon - verifiable without removing them from the tanks, The OPW 71 SO -T Testable Overfill Prevention Valve is the only UST Overfill Prevention Valve that is testable from the surface without removal from the tank . 61 SO & 71 SO Overfill Prevention Valves The OPW 61 SO and 71 SO vapor-tight Overfill Prevention Valves are two-stage shut-off valves designed to prevent the overfill of underground storage tanks by providing a positive shut-off of product delivery. Models of the 61 SO and 71 SO are available to meet virtually any UST application , including two- point, coaxial , poppeted coaxial and remote fill . The 71 SO vapor-tight model is designed for enhanced vapor recovery ( EVR) applications . Both the 61 SO and 71 SO are designed for use on tight-fill gravity drop applications only, and can be installed in the fill riser of both new and existing underground storage tanks. Ball Float Vent Valves and Extractor Fittings OPW Ball Float Vent Valves protrude into underground storage tanks from the Stage I vapor return riser pipe. As the tank becomes full during a product drop, the i ball seats — restricting the flow of vapors back to the transport truck or through ( the tank vent. As the vapors are compressed in the tank, product flow into the tank is severely restricted . OPW ball floats are mounted in OPW extractor fittings to maintain access through grade- level manholes . �i Drop Tubes and Accessories OPW drop tubes are installed inside tank fill risers to prevent fuel from contacting riser joints , Drop tubes extend close to the bottom of the tank to minimize turbulence and vapor production . Tank bottom protectors are installed on the bottom of drop tubes to prevent tank erosion at the fill point. Pressure Vacuum Vents and Adaptors Pressure Vacuum Vents are installed on the top of vent pipes from underground or aboveground fuel storage tanks. The vent cap and internal wire screen are designed torotect the tank vent lines against intrusion and blockage from water, debris or p 9 9 insects. A normally closed poppet in the valve opens at a predetermined pressure or J vacuum setting to allow the tank to vent. 110 9393 Princeton -Glendale Road ,, Hamilton, Ohio USA 45011 Phone : (800) 422 - 2525 Fax : (800) 421 -3297