[desertdog]

I have an older model but have the Bristol Valves. My black tank valve would not open or close all the way. I flushed the tank the best I could and replaced the entire unit. The valve itself, the cable and the handle. As stated earlier, everything but the handle is hidden. I dropped the bottom cover from the front back past the two channels to expose the valve and cable. If you replace the valve as I did be sure to use some silicon on the valve itself to lube it, I'm told it will last a lot longer if you do. I did not get much (a few drops) sewage when I pulled the valve. A tight fit, but with two people it was easy putting the new one in. BTW I also installed a valve to the sewer line where it connects to the Hose and its like a safety valve, so even if one of the primary valves leaks the new one contains everything in the dump line until I've hooked up to the sewer...