This leads to thread stripping, gaskets being squeezed out and, as a result, to hopeless damage to sometimes quite expensive equipment. The connections are tightened manually, without a key, and to be on the safe side, they are tightened just a little bit with a tool. https://nycnewsly.com/read-blog/41872_easy-ways-to-clean-and-maintain-your-seat-covers.html