Cleaner stopped working, valve on the hose seems stuck, how to fix?

[Dagobah]

My cleaner recently stopped working. On closer inspection, all the water was being diverted out of the valve on the hose at it's connection point. I'm not sure what it's supposed to look like. Is it simply stuck, or do I need to replace the assembly?

Pics below:
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[Qwaxalot]

Unless you can find the missing pieces, it's best to just replace it. They are readily available, either Polaris or Pentair.