Cobra-Tek- CBK-HZ-6131-C- Aluminum stainless steel Cotton Filter Push-In valve Cover Clamp on Breather For 1 3/8 inch 1-1/2 inch Tubes W/Shield - Chrome.

"Cobra-Tek- CBK-HZ-6131-C- Aluminum stainless steel Cotton Filter Push-In valve Cover Clamp on Breather For 1 3/8 inch 1-1/2 inch Tubes W/Shield - Chrome. STEEL COTTON FILTER BREATHER CLAMP ON FOR 1 3/8"" TUBES W/SHIELD - CHROME STEEL COTTON FILTER BREATHER CLAMP ON FOR 1 3/8"" TUBES W/SHIELD CHROME Tips: Most valve covers are made from aluminum or steel. These metals deliver strength and durability without the same cracking risks as plastic designs, but that doesn't mean they're an impenetrable product. Valve covers are not under any stress so historically they've been made out of simple stamped steel. But like anything, the more serious the engine gets, the more design changes may be needed in the valve covers. Valve cover gaskets were cork or cork with a rubber binder. These are still available and are good choices for many applications. They conform well to the narrow, rough mating surface of early small-block cast-iron heads Details: Metes or exceeds all original equipment specifications Unsurpassed quality for you can trust Validated for fit, form and function Designed for repair and everyday environment"