Here's a solution! I bought one of these a while ago and it's a great, LONG life alternative too the Dorman/Help brand PCV rubber elbow that dry rots, stretches, cracks and splits in less than a year EVERYTIME. This is a THICK wall silicone/threaded (same as aftermarket turbo/IC hose) elbow! Well made and comes longer than needed so it's easy too use no matter how you have your PCV routed. It's offered in adapting 16mm to 13mm (5/8" to 1/2") just like we need for our valve cover to PCV valve. Anyway I don't make these or have anything too do with them, I'm just a VERY satisfied customer who has been looking for an alternative for a long time and figured I'd share as I'm sure I'm not the only one...