Standard caulk-gun size tube (10.3 FL oz) of aquarium safe silicone sealant. Available in both clear and black. We've been using this for decades on our own aquariums as well as in the manufacture of our sponge filters.
Fits a standard caulk gun. The top is removable, so if the silicone gets hard between uses, you can unscrew the top and clear out the silicone that has "set".
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Learn more about keeping your food fresh in these articles.
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