12 AN Valve Cover Breather Fittings | PCV Race/Street For GM LS/SB/BB | UPR 5045-31

If you’re building an engine—whether it’s an LS, small block, or big block Chevy—these 12 AN valve cover breather fittings from UPR are just the ticket.

They’re great for race cars, street machines, or even marine applications.

The part number is 5045-31, and they’re made right here in the USA from quality aluminum.

They have a universal fit, so they’ll work on a ton of different setups.

They’re designed to work with PCV systems, helping keep your crankcase pressure in check while looking super clean under the hood.

They come with a manufacturer warranty, so you know they’re solid.

Whether you’re going for performance or just want that pro-street look, these fittings deliver.