If the clamps you're referring to are the round ones that used to be found on radiator hoses and heater hoses, then I can recommend the ones that Proto made. I've had a pair for about 40 years and they worked fine. They look like a pair of slip joint plies with deep grooves cut in the end to hold the clamp tips. The only problem is that they didn't have any way to keep the clamp compressed, you had to hold them while you tried to work the hose off.
K-D also made a pair that I think were better. If memory serves, and it often doesn't anymore, they had a ratchet mechanism that held the clamp compressed while you worked the hose off.
Mike