Used to replace the damaged and poor quality idle air mixture screw on the carburetor Upgrades and manufacturing of the sametype of online product, solid brass material instead of iron and copper plating, corrosion resistance, durability and smooth thread characteristics. The bowl mat effectively protects the O-ring andincreases the sealing effect. Fluorine O-rings replace silicone or nitrile O-rings and are characterized by high temperature resistance, corrosion resistance, oil resistance, and aging resistance.