Dedicated Motorsports brings you a simple solution for adding -10an fittings to GM valve covers. These fittings are designed to press or tap into place of the factory 3/8" steel barb found on most LS valve covers. Simply pull out the barb using a vise or pliers followed by tapping the stainless 10an fitting in place using a hammer and a 22mm socket.
The inner diameter of the fitting is just over a 1/4 inch at .290". The idea behind the -10an adapter is not to gain full -10an flow immediately but to make a simple solution for catch can plumbing. If you decide to upgrade valve covers down the road, you will already have the -10an fittings and hose installed.
*********Price is per fitting, most cars will need two.***********