Mercury 300 hour maintenance kit for mercury 15 HP and 20 HP EFI 4-stroke outboard motors.In The Box Oil Filter Fuel Filter, Low pressure Thermostat Thermostat Gaskets Spark Plugs x (3) Water Pump Impeller Kit Lower Unit Anode Gear Case Drain Seals Oil Drain Seals Complete selection of required 300 hour service replacement items in one box. No need to order separate parts. Recommended mercury 4-stroke oil and mercury premium gear lube. Periodic maintenance is easy to do using common shop tools. Follow your owner's manual for recommended service to keep your engine running longer and stronger while protecting your investment in your boating fun. Produced by mercury marine to our stringent original equipment manufacturer specifications to maximize the performance of your mercury and mariner outboard or stern drive. Vehicle Fits: Mercury Outboard 15HP 15HP Sea Pro 0R833820 & Up Maintenance Kits Mercury Outboard 15HP 15HP EFI 0R833820 & Up Maintenance Kits Mercury Outboard 20HP 20HP EFI 0R833820 & Up Maintenance Kits Mercury Outboard 9.9HP 9.9HP EFI 1R008146 & Up Maintenance Kits Mercury Outboard 10HP 10HP EFI 0R833820 & Up Maintenance Kits