The 425 Discrete Interval Sampler is excellent for obtaining representative groundwater samples from below product layers, or for sampling within floating or sinking product layers, and also for sampling at discrete depths in a well. The reel mounted stainless steel sampler has a convenient sample release device and is easy to decontaminate without the need for tools. It is pressurized with a hand pump before entering the well. No water flows through the sampler on the way down the well. When the pressure is released, the sampler fills directly from the sampling zone.