Jayco RV 3 inch rubber grommet seal for RV blank tank / water holding tank. Opening is 3″ inner diameter, 3.75″ outer diameter. Widest point is about 4 5/8″ diameter (see secondary photo for measurement reference).
Used on several different Jayco & Entegra towable and motorized RVs / motorhomes. Jayco part number 0160376.
