A popular modification is to do away with the “security” of keyed hatches and replacing them with thumb latches.
Every Casita hatch as well as most other RV’s use the CH751 key.
I replaced the electrical door and curb side hatch because they are opened most often (hooking up and unhooking at camp). You might want to replace all of the locks or just the ones used the most. I left the locks on the battery door because I rarely open it, and the water fill door to avoid any “surprises” in the water tank.
Replacing the latches requires a screwdriver and an adjustable wrench. The water fill and electrical cord hatch use the 5/8″ size latches while the water tank compartment and battery door use 7/8″. On my particular year Casita, the electrical cord door had a special shortened latch arm, so I swapped it over to the new thumb latch.
I bought the latches from Little House Customs (LHC). Their website notes that 2015 and newer Casitas use larger 1 1/8″ latches on some doors, so measure before you order. You can also get them on Amazon.com.
Now we don’t have to fumble for the keys while hooking up the Casita.