I Just wanted to close the valve...

Did you use pliers or adjustable wrench to shut it off?

Are you going to switch out the blue handle?

Looks like you need to buy a full replacement part if you can't find just the handle with O-Ring and cap.

Your valve looks like the one below:

Videos related to this:

1. Fix A leaking PVC Valve Handle! Dont pay for a plumber! [04:51 | NOV 24 21 | MACH 1 TIPS] https://youtu.be/B3UYsMgeM1k&t=84

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2. Water well repair part 3, Bonus: how to repair a pvc ball valve [23:40 | NOV 12 22 | Scott Flory] https://youtu.be/Bnt4nPPfmmY

• Finishing up the rebuilding of the well, re insulation and repairing a pvc ball valve that started leaking.