Guaranteed Compatibility. Designed for FS45C/FS45L/FS55C/FS55T/FC55/KM55R/HL45 models. Dimensions are identical to the original (tolerance ±0.05 mm). High-performance, ethanol-resistant gaskets. Optimized fuel flow (22% more than standard). Quick installation. Complete kit with valve, nozzle, and filter. Video tutorials available on our website. The product includes 1 E-RFSEY carburetor + 2 gaskets + 2 priming pumps + 1 fuel hose + 1 spark plug + 2 valves, 2 air filters, additional fuel, and 2 air filters. Satisfaction Guarantee. If you have any questions, please contact us immediately. Customer service will respond within 12 business hours.