The Solinst Model 408M Micro Double Valve Pump (Micro DVP) has a remarkably small and flexible design. It is a pneumatic pump similar to a Bladder Pump, but using coaxial Teflon tubing rather than a Teflon bladder to give high-quality samples. It is small enough to fit in 1/2" (13 mm) tubing and all channels of the Solinst Model 403 CMT Systems, as its diameter is only 3/8" (10mm). The unique combination of flexibility and size makes the pump easy to transport and install in a variety of applications. The Micro DVP is ideal for low-flow sampling and narrow down-hole applications. Flow rates of 20 to 150ml/min are obtained, with very small associated purge volumes from within the narrow applications. The Micro DVP is durable and easy to operate using the pre-sets and fine tubing capabilities built into the Solinst Model 466 Electronic Control Unit. It operates with 2ft (0.6m) or more head of water above the intake. The Micro DVP uses coaxial Teflon tubing in lengths of 50', 100', 150', and 200' (15m, 30m, 50m, and 60 m). The 50 ft. (15 m) pump is also available with LDPE outer drive tube and a Teflon inner tube. The pump body and filter is 6 x 3/8" (150x10mm). It is constructed of coaxial Teflon tubing with stainless steel fittings and a 100 mesh stainless steel filter. Filters are easily cleaned and replaced. A manifold at the top end of the pump has a 3/16" (5mm) Teflon sample tube and a quick-connect fitting for easy attachment to the Control Unit. A multi-purge sampling head is also available for use with the CMT System.