i have the actual oddysea major distributor in my back yard. I own five similar cannisters from odyssea, the only difference is instead of a black canister I have the see thru acrylic canister, actually pretty cool cuz you can see water level, uv light on/off, and also can constantly ck if media is dirty. The shut off valves take a lot of force to get them to seat in, don't be afraid to push hard. Two of my canisters have the shut off valves leaking, I went back and they said there's an o-ring that gets knocked out of place, just wiggle back and forth til it reseats. It worked for one of my shut off valves but not the other. Fortunately all five filters are in garage so I don't care if it leaks. The bio balls are garbage so I replaced with ceramic rings, they're fully submerged, rings work better anyways.