Dual drains on 2021 Sundance?

Gray & black tank disposal drains. Are spitters made for this so we don’t have to keep moving the hose back & forth?

Are you looking for something like this?

Sounds like you have front and rear sewer tanks.

The 'Y' connection that Dan posted about is exactly what you need.

You will probably need to buy more sewer hose along with that 'Y' connection.

I had a Heartland Trail Runner TT a few years back and had the same thing...

I carried 40-feet of sewer hose and was almost always enough sewer hose.

You can see it in the photo below...

We have a Sundance 262RB. Because the bath is in the rear and the kitchen is north of the center, we too have 2 sewer discharge points. I use a Y fitting and extra hoses. On overnight stops, I do not install all of that though, I just dump the tanks at each end, one after the other by moving the hose.