Step 3 - Install Water Heater Bypass Hose:
This is the water heater bypass hose in use. It's installed so I don't have to fill my water heater with antifreeze. I sucked all the water out first with a drill mounted pump then placed an Absorber (brand name) synthetic chamois under the drain. After a few hours of rocking at the dock no more water came out.
To install this hose simply disconnect the cold supply and hot return line for the domestic water side of the tank and connect them with the bypass hose.
Do not try to bypass the engine supply & return lines for the water heaters internal coil. these lines will usually be black, like a radiator type hose, and will not generally be the same color as the domestic water side. When in doubt follow the lines. If they lead directly to the engine they are the wrong hoses..