Thanks for all of the advise on witch can to use. I finely foud the right one for me, a 20 gal sump basin witch has about 1/4'' thick walls so it's very strong. The best part is, it only cost me 20 dollars. I would highly recommend it. It already has a lip and every thing so your top could be flat witch makes less work for you. You should be able to find them at any home center I found mine at fleet farm.
rob219
rob219