When you open up the multiport handle (it's easy to do, and only takes a few seconds), you'll know by looking at it whether it's failed or not. I replace one almost every season, and it's usually torn and scrunched up on one side.
Just turn the pump off, turn the handle halfway between two of the settings to take the pressure off, and then unscrew the screws holding it down. Just pay attention to the orientation of the top of the multiport so you'll know which way to put it back on!
Janet
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