I just received my new Hayward W530 Leaf canister. I seemed to have noticed a problem. On the inlet side where I attach the hose coming from my vacuum head there are two notch's that look like it would keep me from sliding on the vacuum hose. The Owner's manual that came with it says there are two adapters available but don't say where they work. The first one shown is the AXV098 and the second is the AXV092. Neither appear to be able to lock onto those notch's. How do they work?