Closed cell foam insert that snaps firmly over the flared mouth of BOD bottles, preventing evaporation of the water seal during the five day incubation period
The foam insert fits into the cap and exerts pressure on the bottle stopper to hold it securely in place.
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Colonial Scientific has teamed up with the industry leaders, Fisher Scientific and VWR, and now offers their entire product line. Colonial Scientific provides any part from the Fisher Scientific site with a part number.