Thanks for the video Aliice🙃 I have two identical mattresses. One has the valve problem. I'm using vegetable oil. I had thought about getting some Vaseline and using it but I did have olive oil in my camping basket.. It's best to use vegetable oil on rubber seals. Petroleum products can damage rubber. 🤔
Im gonna try this with my ses to summit has this issue for 1 year now... Very annoying. Went to sweeden for a week a few days ago and every morning one of the sides was loose .