If you have any access to a farm store, they will have them. In fact I would recommend 16 ga. It is the gauge commonly used in large animals. It works real nice for liquidex. You can also do a search for vet distributors. Or, call (800) JEFFERS. Jeffers is a very large distributor located in Dothan, AL. They UPS all over the world. No order is too small. They also have a website. Do a search and you can find it.