Review on 🚀 Efficient Winterization for RV, Boat, Motorhome, Camper, & Travel Trailer: Air Compressor Quick-connect Plug to Male Garden Faucet Blow Out Adapter Fitting (Solid Lead-Free Brass) by Jeff Rhodes

I used to have a valve stem version that needed someone to hold it all the time. It's much better - connects directly to the compressor hose and I can blow through the lines in my RV myself. Remove the drain plug from the hot water tank and drain, leaving the plug out. Remove the anode (if applicable) and hot water bypass tank. Generate pressure in the water supply systems at a pressure of 40 psi). I repeat this process, returning to the next faucet to the water inlet. Pour some RV antifreeze into all of the P-traps, some into the black tank, and some more into one of the gray tank channels. Run the water pump for 10 seconds. Seconds or so to remove the remaining water.