Finnex px-360, eheim 2213, 2215, eccos is what comes to mind. Stepping down from 5/8 is another option.
Reducing diameter (via adapters) of tubing from 5/8 inch to 13 mm.Stepping down?
I would use hose clamps just in case. I think they run about $0.75/ea for 1".They won't blow off from water pressure?