PLEASE MEASURE EXISTING CAP TO ENSURE FITMENT Peterbilt (Imported) Cap Assy Alum 4.0" Locking for 4" SCH 40/80 Neck Pressure Relief Fuel Tank Must Be Vented 8.00" Chain & 6.50" Bail

Numbers on the underside of the cap: No Numbers

Sold individually; image shows top and underside of cap