See illustration. I installed the kit in both my car and my husband's car. Ok, about 4 days. On the 5th day I left the store to find a completely flat front tire in the parking lot. I called my husband. He told me that his car at work was also the victim of the same thing. The design has flaws and the plastic top will crack and leave you stuck! Luckily, a nice lady took me to an auto parts store to buy a pump and I was able to get back on the road. Then I had to go to work with my husband to inflate his tire. Due to the large investment of time and money for this product. Very disappointed.