The Alpha 19-Gallon Fresh Water Tank (VR385561WBLANK) is sold as a blank tank and does not come with factory-installed threaded ports or fittings. You will need to install your own fittings by spin welding them onto the tank, which allows customization of hole locations and sizes for your specific setup. The tank does not include a pre-installed fitting for the gravity fill tube, so this will need to be added during installation. Most customers use the Elkhart RV Parts Universal Fittings Kit, which provides compatible fittings for freshwater tanks and is designed for easy DIY installation. Individual fittings are also available if you need specific sizes or types. The grommets are not pre-threaded; fittings must be spin welded on to ensure a secure, leak-free connection.