Putzmeister Tommy Gun 3 1/2" x 9/16" steel back up washer for A3 machines. Tommy Gun A3 fireproofing series of mortar machines have increased durability and ease of use, with an operator-friendly hydraulic lift and dump mixer, and a smaller, more rugged frame. This heavy duty machine from Putzmeister is ideal for high-pressure, long-distance plastering. Genuine Putzmeister replacement part.