You can't glue tubing to piping, so hopefully you didn't try! That hose needs to be very snug. They should have sent two different hoses, a smaller diameter one for the return pump, and a larger diameter one for the return. Any chance you swapped those? If not, you will need to pick up smaller diameter tubing. You can get clear tubing from home depot. I usually bring the fittings with me and test fit them to make 100% sure they are correct.
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