Feature●Two-way action pressure relief/vacuum relief valve allows the fuel tank to breathe while preventing the escape of fuel fumes●Seals are compounded from fuel-resistant rubber●Locking Mechanism Deters Fuel Theft & Vandalism●Comes with 2 Keys●Lock Opens with 1/4 Turn of Key●Neck Diameter (in): 1.56Description Meets OEM specifications, Federal and State emission requirements