【Perfect Compatibility】Mercury 135-250 HP Gen 3 2001-Up 【Direct Replacement】Replacement OEM: 878408A1 【Superior Material】Made of superior-quality Viton & High Grade Urethane Seals. Produced on precision CNC machine tools. Hard Anodized for professional level reliability and durability. 【100% Satisfaction Guarantee】Five Star Marine is committed to providing customers with a good product experience, If you cannot rebuild your unit we give you the option to send it into us for rebuild and we will credit the cost of this rebuild kit towards getting your unit professionally done by us, all of our rebuild services come with a Full 2 Year Warranty. This is the Highest Quality Rebuild kit on the market by far built by the specialist who rebuild these units daily. The OEM kit uses faulty seals that turn to mush and leak heavily within 5-10 years. If you cannot rebuild your unit we give you the option to send it into us for rebuild and we will credit the cost of this rebuild kit towards getting your unit professionally done by us, all of our rebuild services come with a Full 2 Year Warranty. This kit use materials like Viton and High Grade Urethane Seals to ensure you will only have to rebuild your unit once for the life of the motor. Why do we use Viton for the wiper on this unit? Because it is Resistant to Ethanol, UVs, Oxidation and has amazing properties for longevity it was formulated by Dupont and costs on average 15 times more than the standard OEM seals. We give you a diagram of the unit, basic instructions and helpful tips. Build your unit once and for all with peace of mind just like the professionals.