B2. 15 push-in (clamp-on) spigot down
Links to photos of examples:
1983 Derbi Variant SLE original
This valve replaces side-mounted Derbi Variant valves. It’s a vertical valve, but on a Derbi it is in a horozontal position. Since there is no curved-up reserve tub, there is no reserve. An aluminum curved-up reserve tube is optional for $12 more.