Hubby said great idea using a union at the pump. We do have them on the skimmer and return lines at the pool entries.I would go with a glued union at that spot since you already have pvc. Those rubber things are terrible. Hose clamps are also terrible. I assume you have that fitting so you can winterize. A union will make that a snap.
In the interim you can sure your bets with 2 hose clamps on each side of the rubber thing. Right next to each other.
Yes, we need to remove pump in the winter to protect it from freeze damage.
Thanks.