The Cat Pumps 34151 Valve Kit is a new accessory specifically designed for use with models 3507, 3517, 6811, and 6821. Made by the reputable brand Cat Pumps, this kit includes high-quality NBR seals to ensure durability and compatibility with your pressure washer. Perfect for maintaining and repairing your pressure washer, this valve kit provides the necessary components to keep your machine operating smoothly and efficiently.