The specific black molded holding tank measuring 60" long, 24" wide, and 6" deep with a 3/4" flange that you referenced (model H929) has been retired by the manufacturer and is no longer available. However, Elkhart RV Parts offers several similar tanks with comparable dimensions and features. These tanks are made from durable high-density polyethylene, typically include a 3" outlet, and can be paired with optional fittings kits for installation. You can explore suitable replacement options using the Tank Finder tool on our website, which allows filtering by length, width, and height to find a compatible tank for your RV. If you need help selecting the best alternative or have any questions, our customer care team is ready to assist.