United Replacement Parts FREE 2-Day Shipping United Replacement Parts United Replacement Parts are available for any reason. Some parts are wearable items that need to be maintained and replaced over time while others are built to last. Even with proper care, parts may break due to accidental damage or improper use, if anything does happen, we have you covered. Unlike other brands, United offers a full line replacement parts to keep your United product up and running, good as new.