All you need to do is weld it in and fill it up!Our own Vented or Non-Vented Gas Cap w/ Steel Stepped Flanged “Tophat” Bung easily welds to any Steel tank.Features:Knurled Cap - Machined from 6061 Billet Aluminum.Vented or Non-Vented - The cap comes with two o-rings. One vented and one non-vented to work with many different applications.Steel Bung - Machined from Mild Steel and stepped to make welding a breeze. Just drill a 1-1/2" hole and drop it in.(2) 1/8" Buna-N O-Rings - Temperature range -35 to +250 F. Durometer hardness is A70.MADE in the USA!Dimensions: Cap ONLY:OD= 1-5/8" Height (Including Threads)= 7/8"Knurled Edge= appx. 1/4"Thread Pitch= 1-1/4"-12Bung ONLY:OD= 1-5/8" Height= 3/8”Thread Pitch= 1-1/4"-12Finish:AluminumIncluded:Billet Aluminum Cap(2) Buna-N SealsSteel Bung*We also offer these with various designs milled into them. See our 'gas cap' section for more information.*