Description: The General Pump 47040409 is a 20mm ceramic piston designed to fit TS1011, TS2021 and TSS1511 pressure washer pumps. This genuine OEM replacement part features a durable ceramic construction and high polish that helps to extend the life of the seal. Please note that three (3) of these ceramic pistons are required to service one pump. For your convenience, this product comes as a set of three pistons. Size: 20mm.