Bolt Hardware 2 Stroke Exhaust Pipe To Silencer Sleeve And Spring Kit Yamaha Yz125 / Yz125X Bolt Hardware presents an essential kit designed to rejuvenate exhaust systems that have suffered wear and tear. Including all-new O-rings, springs, and a coupler/sleeve, this kit ensures your exhaust remains in optimal condition, preventing leaks and ensuring peak performance. Includes: O-rings Coupler Springs Note: Images are for reference only.