A6. 10x1 male spigot back medium shaft
Links to photos of examples:
Like the other 10×1 male valves, the whole valve must turn around and around, to screw on. But the long shaft would usually hit something. That would prevent the valve from screwing on. The original valves had a detachable shaft, held on by a clip. So the valve could be installed or removed without the shaft.
This replacement valve does not have an easily detachable shaft. But the shaft can be removed by loosening the shaft nut. To install the valve, remove the shaft, then screw on the valve, tighten only to a little more than “finger tight”, aim it to face outward or whatever direction is best, then replace the shaft.