Black Tank Flush Check

[mfifield01]

I believe my black tank flush valve is stuck. I just got back from a 2 week trip and can't flush through the external connection. It did work early in the trip, but didn't work at my last stop. Does anyone know what the common valve is for this? Thanks.

[sourdough]

Watch this little video;

https://www.youtube.com/watch?v=-YPkEcyhf3k

It's a pretty good explanation of how/what to look for. More than likely it's the check valve which is a common item. You can get a replacement at a big box store or an RV shop. Some folks replace with OE equipment, brass or I've seen some just cut the valve out and plumb in a "check" by making a big loop in the line with 2 90 degree elbows and eliminating the check valve which I wouldn't recommend.

[mfifield01]

Thanks. I need to pull that check valve and test it. That would be the easier fix.