I had to order vinyl tubing because it was not included in the kit. There are no specifications for the tubing so I ordered something that looked like it would work. As it turns out the vinyl tubing that I ordered was incorrect so i had to order another size of vinyl tubing. After ordering 2 packages of vinyl tubing through Amazon and waiting over 2 weeks i finally got tubing that fit (on one part of the kit but not the other). I am very frustrated because this could be easily avoided with better instructions or the inclusion of the necessary tubing. I have now had this kit for almost a month and it is still not working.