Well I have this for the regular 20oz caulking tubes as I'm a DIYer and like to buy junk stuff anyways suitable for normal tubes. I squeezed them, didn't realize it until I used one quite well. I went to the store, bought a cheap caulking gun, depressurized and put it on, it worked damn cool, it's a fix for the smaller tubes they may have brought back but now it fits both sizes! The canister was clean when I just made two tubes in about five minutes. lol this thing works great when used properly! If you need smaller tubes, just replace the part of the plunger that pushes the cans!
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