The Cat 2W4831 is a genuine Caterpillar engine piston designed for reliable performance in various Cat machinery. This high-quality piston is compatible with Cat 3304 and 3306 industrial, machine, and truck engines, as well as generator sets, marine, and petroleum products. It also fits specific machine models including D5B and D6D track-type tractors, 966C, 966D, and 980B wheel-type loaders, 518 wheel-type skidders, and 621B, 621R, 623B, 627B wheel tractor-scrapers. It replaces OEM part numbers 7N3474 and 9Y4004.