Stop cats from chewing on an oxygen line

Purchase a small bottle of orange scented anti bacterial dish soap, and a bottle of Angostura orange bitters. if the bottle of soap is completely full use or dump out 1 or 2 tablespoons of the soap. Add 1 to 2 tablespoons of Angostura orange bitters to the soap bottle and shake. Using a paper towel or small rag pour a generous amount of the mixture on to the rag and run the oxygen line through it adding more soap if needed. The oxygen line should be slippery when you are done. Coat every bit of Oxygen line the cats can get to unobserved.

Repeat every couple of days. Add more bitters for stubborn cats.

Cats do not like the taste of orange, the anti bacterial agents also have a bitter taste to them, and the bitters contain bitter orange. The combination should keep them from chewing on the Oxygen line. I do not know if it will work for other animals.