Does anyone know the diameter of plastic vinyl tubing that will fit over the fresh water drain outlet on a T@B? This stuff:
I need to drain my fresh water tank, but can't just let it spill out onto the ground where I am. The outlet (I couldn't get a good picture of it) is graduated and looks like if I had the right diameter I could put a bit of clear flexible tubing (like the stuff used in aquariums) on the end and let that drain out into an approved area.

It's buried back behind the front step and I'm having a heck of a time trying to get a measuring tape back there to measure. I'm so far away from a hardware store it's going to be a major time investment to travel to one so I want to make sure I know the right size! Does anyone know? Thanks!
2018 T@B Max S silver and black (aka TadT@B), Full-timing since July 2017
Comments
2023 Tab 400 / 2022 F150 XLT Sport 3.5EB
Traded in - 2018 T@B 320 S/2019 Toyota 4Runner SR5
Utah Driven
2019 T@B 400 (Ex 2018 400)
2015 MB GLK 250 Diesel
2018 GMC Canyon Denali Duramax CCSB
2018 T@B Max S silver and black (aka TadT@B), Full-timing since July 2017
TV: 2006 Chevy Avalanche LT Z71 aka: WhiteWolf, or 1972 Chevy Custom10 P/U aka: SnarlingWolf
Spokane, Wa.
Eric aka: Lone Wolf
But the concept of using clear PVC, vinyl correct size hose works for most. I just added the standard size female hose end which also was the same inlet size and cap to keep the internals clean and free of dirt, plus able easily attach a standard hose to further direction the emptying water.
Utah Driven
2019 T@B 400 (Ex 2018 400)
2015 MB GLK 250 Diesel
2018 GMC Canyon Denali Duramax CCSB