The Thetford 12901 Porta-Potti Waterfill Cap is a replacement accessory part designed for use with Thetford Porta-Potti portable toilets. Made in the United States by Thetford, this waterfill cap is covered by a 90-day warranty. It is important to note that this product may contain substances known to the state of California to cause cancer, birth defects, or other reproductive harm, as indicated by the California Prop 65 Warning.