All of our tanks are made of the highest quality aluminum, they are hand cut, assembled, and hand welded using the latest equipment. All tanks that are over 2 quart in capacity have a baffle to stop the gas from sloshing away from the outlet. (This is not an option in a plastic tank.) Tanks from 1 quart to 4 quart all include a fuel sight tube which is also available on larger tanks; all you have to do is specify this on your order. The pro series tanks include a fuel return port that can also be added to any tank at time of ordering. Since the tanks are made to order, we are able to accommodate special requests.