Weird question I know. A few months back, I gave away a bunch of stuff I didn't need anymore and someone took an AquaClear 20. Forgot who got what, and the PMs have since been deleted. Today I found a AC20 lid while cleaning around, and since I only had the one, I assume I probably forgot to include it when I gave the filter away. If you're the one who got the AC20, let me know if you need the lid.