I have a SC 20/20 semen tank for sale. The tank stilll has N in it right now but no semen. I just got a new one with some semen I bought and don't need this one anymore. i think the tank will hold about 700 straws. The tank has 6 places for canisters but I only have 4. It would be easy to get two more, but i never needed that much space. The tank is in really good shape and was on a 2 to 3 month service. Asking 250.00 any Qs on the tank let me know 501-230-1202 or message