Good find, Randalnh. Thank you.
There's a great video here on rebuilding the valve using the repair kit:
https://www.youtube.com/watch?v=C1lvvHjG4EI
At the end of the video, a note says that rebuilding the valve is time consuming and you're better off buying a new valve! I'm sure that applies to me, with zero plumbing skills. I have replaced the O rings inside the hoses before but I didn't go beyond that. Apparently when the valve is leaking in the ON position you have to disassemble the whole thing and replace the O rings and teflon disks.
Repair kit: $23. New valve: $35. I'll get a new valve.