Quicksilver 811635Q2 Distributor Cap Kit - Marinized 4-Cylinder Engines by General Motors with Delco EST Ignition Systems The distributor cap is made from a blend of PBT and pet plastics for increased strength, stiffness and resistance to warpage important in this design of distributor Produced to Meet Mercury marine original equipment Manufacturer specifications to best protect your mercuries engine Solid brass inserts resist corrosion and electrical pitting for long service life High strength to weight ratio rotor for durability and resistance to thermal cracking Designed to resist rift interference with onboard electronics