Review on Camco 0.5-Inch RV Water Heater Drain Valve Replacement - Easy Installation, Durable Brass Construction - (11703) by Domonic Roberts

As we camp every few weeks in the summer I have made it a habit to drain the system between trips. I do this by removing the water heater (WH) drain and opening both main drain valves (bottom) along with the faucet valves to allow air into the system to allow water to drain. Yes, there is still water in the lines, but not much. A wrench was required to remove the standard WH drain plug, so I bought this drain valve to make the process easier. The next time I followed the same procedure and drained the system, but this time I opened up (and left open) a new WH drain. The ride afterwards our water smelled bad - like rotten eggs. To get rid of the smell, the system had to be flushed with disinfectant several times. Along with the approaching winter, I followed the standard drain procedure to figure out what went wrong. I then used an air compressor to blow air through the lines. With a lack of pressure in the system and an open drain from the new KN, no water flowed from the KN. When pressed, a small trickle of water flowed out. I closed all faucets and valves except for the VT drain and water flowed steadily from that drain plug. Apparently there was still water in the KN. I pulled the drain out all the way and was able to drain the entire 6 gallon volume from the WH. So, at least on my camper, the small diameter of this drain prevents water from draining away - even with the hot water taps open to bleed the system. Pulling out the drain plug allows air to enter and exit (Boule, Boule, Boule). the wh. So I went back to using the standard drain plug.