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Polyethylene cap prevents evaporation of water seal during the five-day BOD incubation period
Foam insert fits into the cap and exerts pressure on the bottle stopper to hold it securely in place.
Wheaton BOD Bottle Cap, complete with a closed cell foam insert, snaps firmly over the flared mouth of Wheaton BOD bottles. This closure prevents the evaporation of the water seal during the five-day BOD incubation period. The foam insert fits into the cap and exerts pressure on the bottle stopper to hold it securely in place.