Sea Dog Locking Stainless Steel Fuel Deck Fill These Locking Hose Deck Fills feature a locking cap to prevent fuel theft. Cap spins freely when in the locked position. To unlock the cap, turn key until key hole is inline with the cap tabs shown in photo. Cap diameter 2-18, thread pitch 11-12 NPSM straight. Color-coded with international symbols for easy deck fill identification. Includes two keys and cap attachment cable. Constructed of corrosion resistant investment cast 316 stainless steel for