Yes, we offer replacement fresh water tank fill fittings suitable for RVs. Based on your measurement of approximately 1.5 inches, the closest fitting we carry is designed for a 1-5/8 inch hole size, which may work if your tank hole is similar. We recommend confirming the exact hole diameter in your tank and the outside diameter of the hose or neck you need to connect before ordering. Installation typically involves removing the broken fitting, cleaning the area, and properly sealing or welding the new fitting to the tank, depending on its construction. You can browse all our RV tank fittings on our website to find the best match.