Description: Product Contains: 4pcs Small O-Ring and 4pcs Big O-Ring Compatible with Sun Joe Pressure Washer SPX4001/SPX3001/SPX3500/SPX3501/SPX4000 SPX3000-ORING SPX3000 Pressure Washer Replacement O-Rings for SPX3000, SPX3001, SPX3500, SPX3501, SPX4000, SPX4001 Electric Pressure Washers Sizes : Small: ID:8.2mm OD:12.8mm, Thickness:2.4mm. Big: ID:10.2mm, OD:15mm, Thickness: 2.4mm. OUR PLEDGE TO YOU: 30-Day Money Back Satisfaction Guarantee! Fit and Function Guarantee！ Fast & Free Shipping! (Except Alaska & Hawaii) Buy with confidence！ Have questions? Send us a message with your model number and spec number and we would be happy to confirm compatibility! Many replacement parts should be installed only by a professional. If you are not qualified to install this item, you are more.