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Reverse tiPiston / Poppet Combination Reverse Ratio means the leak detector has a smaller diameter piston area than the poppet it is attached to . This smaller piston area keeps the leak detector in the fast fill position ( 3 GPM ) to a higher line pressure while compressing vapor pockets and expanding flexible pipes faster. This means less time to full flow, The leak detector does not have to completely reset ( as with competitive leak detectors) for the poppet to be forced into the reset mode at pump start- up . Smaller Volume / Faster Response Piston Size With a reduced piston size , there is one-fourth the fuel volume to replace when in leak search and one-fourth the fuel volume to return to the line when the pump turns off. This combination makes for a more responsive and faster leak detector. Less volume to leave the line for the leak detector to reset and catch leaks . Less volume to fill and provide full flow for dispensing) Superior I x ® i rf rm nc The reduced surface area of the piston significantly reduces the surface area exposed to hydraulic line shock . This results in enhanced performance with steel and fiberglass pipe , and especially with today 's flexible pipe . 99 ® 0\ In the early 1990 ' s , the first commercially successful flexible pipe , Total Containment PP- 1500 , was introduced to the U . S . petroleum industry. Due to the flexibility of this pipe system , no line leak detection would work . In 1992 , the Vnni LD- 2000\ E was certified for 3 GPH @ 10 PSI on Total Containment PP- 1500 pipe . The 99 LD- 2000\ E is still required for existing PP- 1500 pipe . Additionally, today the 99 LD-2000\E is used in sites that have the same line characteristics as the LD-2000\ E was originally certified for, even though the pipe is different . The original certification of the LD-2000\E concerned the bleed - back modulus of PP- 1500 pipe . Today, lines with high bleed - back (generally above 600 ml . ) and high head pressure may require the 99 LD-2000\ E to pass a field test for annual certification . Consult with factory before ordering and installing the 99 LD- 2000\ Ea Electronic Line Leaket cti n r The 99 LD - 2000 may be upgraded in the field to eliminate thermal induced slow-flow, provide submersible shut- down , and alarm notification to site monitoring equipment . Request information on the ISM4080 , an easy upgrade for existing or new installations . The ISM -4080 also stages turbines and controls solenoid valves for loading racks and marine applications . If there is no need for staged turbines , solenoid valve control , alarm notification or submersible shut-down , request information on the ARM -4073 to eliminate false alarms only. 5 . 000