Halloween // How to Keep Inflatable Inflated?

I have the Little Mermaid Ursula costume with inflated tentacles ( Here: https://www.halloweencostumes.com/little-mermaid-womens-ursula-prestige-costume.html) . The problem is that the inflation seems to work by continuously drawing and cycling air into the tentacles. When I wore it last year the way the tentacles connect to the bodice blocks the air fan and the tentacles start to deflate. I'm looking for a way to stop this from happening. If I need to attach pictures or video, I can.