Okay. Sorry for the delays. Mostly been sick and busy. The kegs are all Cornelius brand. 2 are taller, 1 is shorter, but they all say 5 gallon. Two have pin lock stems, 1 is stem-less. I thought I had the pin lock socket AND ball lock socekt; nope, just ball lock. Went ahead and cleaned them, but now I guess I'll have to order a pin lock socket to remove stems. I found one for ~$13 + s/h. I also found conversion kits for $11.00. So, I guess I'll trade pin-for-ball, or sell for $8/each. Is that fair?