Howdy. I have a 500 gallon tank in my yard but sometimes I get empty due to my road conditions in winter and have to wait a few days until road is cleaned up. I want to be able to connect a 20 or 30lb tank into my house line strictly to run my LP gas water heater and maybe the LP kitchen stove. I have a secondary regulator on my exterior wall that I assume I could put a T fitting of some sort before or after it to connect small LP tanks to as-needed. And then cap it when I don't need it. I have not been able to find the parts and directions online though. I find a whole bunch of stuff on RV auxillary connections but nothing for the home. Has anyone tried to do this? I can take a picture of my setup outside if needed. Thanks much!