Don't use long nose pliers. They can damage the plastic. I made a valve wrench from 1/2 inch pvc pipe. Cut an 8 inch length. On one end, cut opposite notches about 3/8 inch deep with a dremel bur tool. about an inch from the opposite end, cut a through hole, so you can use a pencil to turn the "wrench". My 1/2 inch pipe was a bit of a tight fit in the valve hole, so I sanded the final inch of the business end by hand with a piece of sandpaper. Works great.
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