Metric fittings are widely used in automotive applications however repeated servicing will require replacing a washer to ensure that it does not leak. HPS AN to Metric adapter fittings converts your female metric threads to AN style fitting for easy, repeated serviceability. AN style fittings can be installed and removed many times without using any additional sealants or gaskets. HPS AN to Metric adapters are made from 6061 aluminum and Type II anodized black to provide improved abrasion and corrosion resistance.