Hello from Virginia Beach, Virginia

[av8ingtom]

Just purchased a 2020 Four Winds 31W. New to Class C motorhomes. We previously owned a Forest River XLR NITRO Toy Hauler. We have owed the Class C for about a month now, and just finished our first trip for the Thanksgiving Holiday. All was great until I hooked up the black Water flush hose and found out that we must have a broken anti siphon valve. Had a few gallons of water in the camper. Cleaned it all up, and just flushed the black tank with a black tank wand. Still do not understand why Thor would install a anti siphon valve inside of and interior wall with no inspection panel. We love the new class C and we are looking forward to making a few trips in the near future. Next trip is planned for Louisiana.

[EA37TS]

In my prior C the valve for the black tank flush was located under the bathroom sink in a high location. I had to change mine and it was extremely difficult due to its location. That was a Forest River Sunseeker.

[av8ingtom]

Thank you for your response. I looked everywhere and was told by Thor technical that the valve was inside the wall.