Bel-Art Heavy Duty Polyethylene Rectangular Tank with Top Flanges and Faucet; 21 x 16 x 14 in. (H34096-0000) Seamless, rotational-molded polyethylene tanks are lightweight and easy-to-handle 3/8" Wall thickness Tanks are resistant to most acids and all alkalis Tank are made with wide top flanges, include covers, and can be supplied with spigots, fittings, dams, partitions etc