Earls AT592906ERL Ano-Tuff Cap, (Pack of 2) Exclusive Hard-Anodized Coating; Bagged Packaging; AN Cap; Fitting Size -06AN; 2 Per Package Coating Penetrates Aluminum For Wear Resistance Coating Penetrates Aluminum For Corrosion Resistance Provides An Aggressive Look For Your Engine Last Twice As Long As Traditional Anodized Fitting