This is a genuine Craftsman replacement part. The O-ring seal is designed by the manufacturer for use in power tools such as chainsaws, air compressors, power washers, and grinders. This part includes eight flexible rubber O-rings, which may be found in various locations in the machine, depending on model. Please be aware that there ar...Read moree different O-rings used in the machine. Refer to the parts diagram to be sure of ordering the correct part.