NOTE: The images shown are for reference only, the actual product may differ.Therefore please always read the description or read on the corresponding catalog page.
1/4" NPT, StraightText excerpt from the catalog:
Genuine Zodiac fuel valves with disc-type Viton internal seals. 3/8" NPT fits internal threaded pre-1975 and many Custom tanks. 1/4" NPT fits many Custom tanks.