Heater Hose Clamp Problem

Yes the clamp is for a 1/2" hose and nipple. Just won't fit tight enough to hold the hose on without being able to grab it and pull it right off.

Maybe the hose is a little loose and oversized as well. We talked about him getting a piece of standard 1/2" heater hose to check and see if this would work better than the correct repro stuff.

Thanks for the continued responses.