Want to add a -8an feed line to your Mustang but still using the stock hat and pump assembly? This fitting is perfect for that job! It's a 2 piece fitting that uses a threaded collar to secure and seal it tightly to the stock 3/8" outlet on the stock hat assembly and features a -8an male flare for the outlet. This is the same fitting we use in our Lethal Performance feed line upgrade kits.