The ultimate protection against fuel theft and vandalism.* Patented locking cap with unique mechanism. Extremely secure cap rotates freely when locked.* Polished chrome with copper plating base coat or clear powder paint coating finish* Each cap has a water tight nylon screw cap to protect the key hole from weather conditions.* Proven trustworthy under severe winter conditions (-30 F)* Made of thick aluminum die cast * Keyed alike or master key options available* 500,000 different key combinations