Needle Valve, 1.5, Part 3131146 is a specific part that goes into the carburetor. It’s function is to open and close the inlet hose. It’s a genuine OEM part that is tested by Polaris engineers through extensive lab and field tests to ensure durability and high quality performance ultimately giving you the best riding experience possible. It meets ASTM, D2000 regulations and is chemical and environmental resistant letting you ride longer and harder. We’ve been a leader in the snowmobile industry for nearly 70 years, don’t settle for anything less than OEM quality.