This cartridge gun does not have a punch to pierce a new cartridge tube. It also removes too much sealant or silicone without stopping. I have to keep releasing the pressure to stop the flow, unlike my other cheaper caulking guns I have, this one is even worse in terms of overall features and practicality. The smaller sealing tools that come with it are just there to make the gun look like a better buy, but I personally don't recommend this for everyone. I renovate and renovate so I don't recommend this.
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