u/Time-Lapser_PRO

Hello! Earlier this year I accidentally popped out the handle on the valve for my water heater bypass. On the black plastic handle, there is a small brass part that goes into the valve itself and actuates it. Unfortunately when I tried to reinstall it, I completely shredded the little o-ring that goes around it to seal the valve. Does anyone happen to know the size of that o-ring or know where to find a sort of parts diagram for the valve? Thank you!

The trailer is a 2011 StarCraft AR-One 15RB