Usually group24 wet dual purpose batteries are the standard Georgetown battery from the dealer. These can be either factory sealed & valved wet cells that can't be watered which is a poor choice for the application...or they can be fillable wet cells.
Unlike a lot of batteries...most group 24s of this type have a "3 hole cover" instead of separate caps for each cell. You just need to get a thin flat screwdriver in under the cover and pry it off...then do it again for the other 3 cells. Should look something like this:
Note that the rest of the battery top may also be raised to make these covers look recessed. Still just pry them off.
Don't pry off or attempt to pry off anything that says maintenence free or sealed lead acid on the label!