The following holding tanks are made of a tough polyethylene and are in use by many of the most popular coaches on the market. Unless otherwise specified, all tanks have a 3" drain. If you don't see the model you need, give our customer service department a call and we'll help you find it! All holding tanks are NON-Stock and NON-Returnable. Lead time is approximately 2 - 3 week plus shipping. SHIPPING AND HANDLING RATES ARE AN APPROXIMATION ONLY AND MAY VARY.