This starter relay is professionally engineered as an aftermarket replacement for Polaris jet ski models. It fits SL 780, SLX 1050 and SLXH 1050 watercraft perfectly, acting as the core switch for the starting system to guarantee reliable engine ignition.Adopting fully sealed marine-grade construction, it effectively withstands humid water environment, splashing water, salt fog and vibration during riding. It solves common problems such as intermittent starting, clicking noise and no crank failure, being a durable and cost-effective spare part for jet ski daily maintenance.