Vacuum Bell This is a medical device used to improve pectus excavatum (sunken chest). I am selling it because the condition has improved and it is no longer needed. The pump material is rubber, so there are cracks due to deterioration. (Photos 3, 4, and 5) When using it, you can press the cracks in the pump part (photo 3) with your finger, and there will be no problem. The items included are only those in the images. The device will be sterilized with alcohol before shipping.