Black tank/Gray tank termination valves

[Arizonacouple]

NVM. I read the post about stuck valves and I used brute force to open my valves. Normally, I use force as a last resort (broken too many things in the past due to lack of information). My valves have not been used for at least 12-15 months and must have "froze" in place. They closed much more easily and then re-opening them was a breeze. Thanks for reading post and sorry for being a noob on this topic. I'm much used to the dump valves you can see and pull.