PERKO Inc. - Catalog - Fills & Tank Vents - Locking Fuel Fill Insert [0525]
PERKO Inc. - Catalog - Fills & Tank Vents - Fuel System Locking Cap for 1-1/2" Non-Vented Fills [1324]
PERKO Fuel Systems
PERKO Inc. - Catalog - Fuel System Components - Replacement Cap - 0576 Style [0576]
Amazon.com: Perko 1324DP0BLK Locking Gas Cap : Perko, Inc.: Sports & Outdoors
PERKO Inc. - Catalog - Fuel System Components - Sealed Ratcheting Cap Fills with Pressure Relief and Color Coded Metallic Insert - Straight Neck [0781]