Don't be fooled by other versions that are not sealed for powersports off-road applications. On ATV's and Side by Sides, the last thing you want is moisture getting in your electrical connections. This is a direct OEM replacement relay for Polaris OEM Part numbers 4011283, 4016819. The number on the relay reads 303-1AH-C-R1-U01-12VDC. It's a high quality, 4 terminal, fully waterproof and sealed relay that will plug and clip directly into your factory socket and give you trouble free operation for years to come. This relay powers the cooling fan on many Polaris ATV's and Side by Sides from 2010 to current year models. Pro Tip: To extend the life of your electrical system, relays, fuses etc., we recommend putting a dab of di-electric grease on the terminals of any relays you replace. This is effective at keeping moisture out of your electrical connections. We not only sell parts, but we service and ride our own buggys and ATV's and put our parts to the test. Your satisfaction is our #1 concern, please don't hesitate to ask if you have any questions. We are proud to be a veteran owned small business and we will help you out any way we can.