Best thing is to take a piece of your hose and try several types of clamps. There are different conduit clamps for metal conduit and and PVC with slightly different diameters and shapes. I like the tighter fitting ones that are reinforced with the ridge down the middle. Also some slight variations with the mounting holes where you may need to grind slightly to get clearance.

I can get name on box of the ones I used but will be later tonight before I can get to them.

Here are the first ones I used and they were actually a little too loose for my liking.

These are what I ended up using and they hold the hose much tighter.