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Two, rigid 8-ft lengths of clear, 1-1/4?dia polycarbonate tubing will not turn cloudy from sunlight or become brittle in cold weather like acrylic sludge samplers. The design offers a slip-lock quick-disconnect coupler and twin double O-Ring seals to ensure a rugged, Liquid-tight connection. Core taker features a check Valve for sample release; soft foam, floating lanyard handle; and pre-numbered yellow 1-ft markers. Ideal for direct measurement of sludge blanket thickness by core sample Extraction lifetime, no breakage guarantee. Floats for easy retrieval. No threaded couplers ? uses slip-loc