The 408 Double Valve Pump (DVP) is similar to the Bladder Pump, but without a bladder. It is a gas drive pump suitable for applications of almost any depth and narrow diameters. It is available in stainless steel in 1.66" or 5/8" diameter (42 mm or 16 mm) and in PVC in 1.66" (42 mm). Portable and dedicated versions are available. The DVP 1.66" (42 mm) converts easily into a Bladder Pump, if desired.

All pumps can be quickly disassembled for decontamination, and are operated using the Model 466 Electronic Control Unit below. Pumps may be fitted with pneumatic/hydraulic packers to reduce purge volumes. (See Model 800 Packers.) For narrow diameters use the Model 408M.

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