I purchased a radiator cap for my polaris xplorer 500. It arrived before expected in perfect shape and packaged well. It fits perfectly and works correctly. I've already tested it for leaks and it does not leak. This was an oem part that had an excellent price. 5 stars all the way!
There are different caps that fit the same bottle. The caps are machine specific. You need to make sure you have the correct part number for your specific year and model of sled.