Product Description 1.Stainless steel breather with o-ring to prevent loosening with vibration. 2.Direct installation. Any further modifications are not needed,it is more conveniently and easily. 3.Good sealing.(The oil will not penetrate easily) Fitment for FORD E-150 1999-2003 4.2L FORD E-250 1999-2003 4.2L FORD F-150 1999-2003 4.2L FORD F-150 HERITAGE 2004 4.2L Note .