Elkhart RV Parts can manufacture custom fresh water tanks tailored to your specifications, including the 50" x 34" x 9" size you require. These tanks are designed for potable water use and can be produced without pre-installed fittings if you prefer to install them yourself. However, custom molds for one-off tanks carry a high setup cost, typically reserved for repeat business orders. We recommend reviewing our closest standard option, the Alpha 38 Gallon Fresh Water Tank (55" x 24" x 7"), which is potable water safe and durable. For exact custom tanks, please contact us directly for a detailed quote and estimated lead time based on your specifications and order volume.