For the first time we have developed a line of Curved Squeegees that we call ?Wave? pattern. They are curved and conform to the curvature of the round tank that you are cleaning. No more trying to drag a straight squeegee in a round tank and leaving the material behind. Now with these curved designs you can remove all the debris in a 40?, 60?, 72? or 108? train tanker. Made of double steel walls with a thick 1?4? abrasion and oil resistant neoprene hard rubber wiper, they connect up to our stand fiberglass poles in any length you need. Please see STD-6 for the 6 foot pole to start.