A26, A26a. 14x1 female spigot left
Links to photos of examples:
1978 Honda NC50 Express original valve
1980 Honda NC50 Express original
1981 Honda NC50 Express original
Short reserve tube for short gas tanks.
Links to photos of examples:
1979 Oakwood Catalina replacement
(original was spigot-right)
Long reserve tube for tall gas tanks.
This spigot left valve was original on Honda NC50 Express. It also substitutes for other 14×1 thread valves, including Yamaha QT50 (spigot right), Honda NA50 (spigot down), Trac Eagle (side mount), and most Taiwan-made mopeds (mostly spigot back).
Honda Design: Note that the little arrow on the handle points opposite to the handle. So off is arrow left (handle right), on is arrow up (handle down), reserve is arrow down (handle up).
This valve has a 6.5 mm spigot, for a 3/16″ (4.8mm) hose, or a 1/4″ (6.3mm) hose with clamps.