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Smaller Volume / Faster Response Piston Size With a reduced piston size, there is one-fourth the volume to replace when in leak search and one-fourth the 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 Flex -Pipe Performance 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 LD -2000\E 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 VMI 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\E. Compatible With ARM -4073, ISM -4080, ISM -4081 The 99 LD -2000 is compatible with the ARM -4073, ISM -4080 and ISM -4081. The ARM and ISM modules are able to eliminate thermal inducted slow flow at a site. The ISM modules will provide submersible shutdown at the detection of a leak and site monitoring interface or alarm notification. Read about the benefits of these devices on our web site, request a product brochure or talk to one of our sales staff. Shortest Leak Detector Profile The 99 series leak detectors are the lowest profile leak detectors available today.