I will have a ½” ID hose for a pressurized city water connection in case I am at a site with water service. I have a regulator to limit to 50 psi. I am considering a diverter valve so that I can use the connection to either provide water to fixtures, or fill my freshwater tank. If I fill with a pressurized connection, what size vent would I need? Anyone here who has burst a tank doing a pressure fill with an inadequate vent?