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Simple, versatile, and easy to use. Thin-wall core barrels and positive check valveassembly collects quality samples in a variety of sediments and conditions. An excellent quality brass check valve provides good flushing and positive vacuum to retain cores during recovery, without core catchers. Upon retrieval, one must plug the bottom of the core tube before breaking the air-water interface (with core extruding plug or poly end cap) to prevent loss of sample. Clear polycarbonate core barre material readily available at most plastic distributors.