EVIL ENERGY is our brand, we're a direct and professional manufaturer, one of greatest manufacturer and exporter in Tuning parts include intake system, exhaust system, engine system, cooling system, interior&exterior parts.16AN female to male 1 NPT swivel adapter,the thread size of 16AN is 1-5/16-12 UNF, NPT is1-11.5 NPT.The AN side is sealed by a 37 degree angle and the NPT thread side is sealed by a 60 degree tapered thread.It is highly recommended to use sealant or PTFE tape at the NPT side to avoid leakage.Widely used in fuel line,fuel pump,brake line,fuel cell, LS engine,etc.