# 6.5 fits many carboys

# 6.5 fits many glass carboys, just be careful as it can slip inside. Your one-stop shop for all your rubber stopper needs. We have a large, in-stock inventory of gum rubber stoppers available in a variety of sizes, made from off-white pure gum rubber. These stoppers have a molded or drilled 3/8" hole, which can accomodate an airlock. Manufactured in the USA!