Feature: 1. Perfect Fitment: Unloader valve assembly is replacement for Troy Bilt pressure washer pump, perfect matching. 2. Replace Part Number: The part number of pressure washer pump unloader valve is 309515003 and 308418003. 3. High Quality Material: Unloader valve is made of high quality steel alloy and copper material, high strength, sturdy and durable. 4. Original Standard: According to original standard, you can directly replace the old or damaged unloader valve assy. 5. Easy Installation: Easy to install, no complicated operation is required, convenient for using, save your time and energy. Specification: Item Type: Unloader Valve Material: Steel alloy + copper Application: Aftermarket replacement parts to replace the original unloading valve Replace Part Number: 309515003, 308418003 Fitment: Replacement for Troy Bilt Pressure Washer Pump Package List: 1 x Unloader Valve Note: Please double check the part number of your item, matching information is for reference only. If you are unsure of the item, please contact us before buying to avoid unnecessary return, thanks!