★These black rubber grommets are designed for use with ALUMINUM valve covers with a 1.25" hole and allows the use of a 3/4" push in (PVC) Positive Crankcase Ventilation valve or breather with 3/4" neck
★Dimensions Are O.D. 1 1/4" I.D. 3/4" (These Are Most Commonly Used For Pcv Valves)
★Fits all original& aftermarketpolished aluminum, chromed aluminum,etc. valve covers.
★The OD (outside diameter) fits the valve cover hole and the ID (inside diameter) fits the PVC valve or breather.