The pic of the filter shows the cap... I made a gasket with silicone to stop leaking... I haven't cleaned it yet so I don't know if that gasket will hold the next time or if I will have to run a bead of silicone every time I clean it... that's fine though... this filter shouldn't need cleaned very often
So cleaning the big filter proved to be a royal pain... Redesigned with a separate small mechanical filter chamber (2" compression coupling) that is filled with floss. Also added a valve for quick water changes... I should never have to take the big canister off the tank again