I really like my tractor models, but keeping them clean when you live in an old farm house can be a real pain in the asterisk:P. Well, if you are looking for a reasonably priced solution go to WalMart or any other general discount place and get a small aquarium they come in a variety of sizes and are made out of tempered glass. I have used this solution on many of my tractors. BTW, the tank for #3 cost $7 at Meijer and looks like it was made for it.