I got my first wet dry the other day and hooked it up. Worked great but when I unplugged the pump it suctioned back through the return line. I know it will only go as low as the return is but it ends up being too much ( or very close ) for my sump. I was wondering if there is a check valve for 3/4 inch tubing or would I have to plumb it with pvc. Does everyone else worry about this? Is the pump supposed to have a built in check? Should I just raise the return? Thanks.

