Plasticoid M18 Kjeldahl One Hole White Rubber Stoppers are specially made for use with 500 mL and 800 mL Kjeldahl nitrogen determination flasks. Natural Rubber, Pure Gum stoppers have a low sulfer content and provides excellent durabilty and resilience. Hole diameter on stoppers with hole is 8 mm. One-hole style can be enlarge or the solid stopper bored to take larger sizes. For use with food grade applications such as homebrew beer and wine making used with carboys.
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