This Genuine Tohatsu Marine Part is a piston ring set in standard size. It is designed specifically for Tohatsu outboard motors. The piston ring set is an essential component of the engine, responsible for creating a tight seal between the piston and the cylinder wall. This ensures optimal compression and prevents any leakage of combustion gases. With the part number 3T1-87123-0, this piston ring set is a reliable and high-quality replacement option for maintaining the performance and efficiency of your Tohatsu outboard motor.