IAG Stainless Steel AN AOS Breather Fitting SetAs part of IAG's ongoing Subaru EJ Series engine performance program, we have developed a stainless steel AN breather fitting set with a focus on performance and serviceability. Our Stainless Steel AN Breather Kit allows you to use lightweight racing hoses with AN fittings which are easier as well as faster to remove and reinstall when you need to service your EJ at the track. AN fittings also provide a more reliable hose connection on the engine