New in Box.
Sierra 18-3918 Piston Ring - Set Of 2
MFG Code: ERA
 
Bore Size: 2.875 / STD
For: 2 Ring Pistons
3 of 18-3918 = 1 of 39-817096A6
Premium Quality For Longer Life
Meets or exceeds manufacturer's recommended specificationss
 
Sierra has been supplying the most outstanding aftermarket components in the maritime industry for over 50 years, allowing boaters to have the best time possible on the water.
Mercury RINGS-Standard. 2 RING Inch-LINE (18-3918) supports the piston, allowing the engine to run smoothly. It also keeps the piston from contacting the cylinder wall too hard. The piston is supported by the piston ring, which allows the piston to move smoothly up and down.