The Polaris Plastic Wheel Screw (C55) is white in color and is a factory replacement for authentic Polaris pressure- side pool cleaners - the global leader in pressure cleaning. The Polaris C55 wheel screw is designed to secure the small idler wheel (C16, or K27 for 280 Tank Trax) or the large wheels (C6) and bearings (C60) to the cleaner. Refer to the Polaris cleaner owner’s manual for maintenance tips and troubleshooting.