1、Applicable Model: The rear brake master cylinder is replacement for Polaris Magnum Scrambler Sport Sportsman Trail Worker Xpedition Xplorer. Please confirm whether it is consistent with the product you want before buying to avoid unnecessary return. 2、OE Number: The part numbers for reference are 1910301, 1910311, 1910791, 1910790, 1911113, replacement part number is 1930899. Please confirm whether it is consistent with the OE you need to avoid wrong buying and other problems. 3、High Performance: The brake master cylinder assembly prevents fluid bypass for sturdy, safe, and reliable operation. Enhances stability and durability of your ATV. 4、Premium Material: The rear brake pump is made of sturdy ABS and metal materials that resist damage and ensure long term use, high strength and rust proof. 5、Convenient Fixation: The brake master cylinder pump comes with a fluid reservoir and an long hose for complete fixation of the rear brake cylinder, saving you time and effort.