Product packaging clearly states "Applies to all caulk and glue tubes". Unfortunately this is not the case as the internal threads of the flextension tube do not have anything to catch on the sealant tube. Squeezing the flextension firmly against the tip of the caulking hose didn't work either, leading to a mess. The only way to use them was to cut the tip of the caulk to the inside diameter of the flextension and then glue the flextension to the end of the caulk. Well it's a joke!
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