Motor Seal Ring for Fluval 304, 404, 305, 405, 306, 406 Canister Filters

The ring does its job well, avoid the fluval filter.
1: It has no Opening Mechanism (you gotta pry the top off with a table-knife or such). This mars the plastic where this ring goes. That's a star knocked off
2:The Priming Pump is a serious pain. It's hard to grip and does a poor job. If the filter is under anything, "poor" becomes "ineffectual". This is a second star knocked off.
3: The lack of a carry handle is ridiculous but not star-worthy.