DMS brings you a fitting commonly needed, yet hard to find. This fitting is designed to connect a pair of 3/8" EFI hard lines together. Much like you would find on the end of a GM flex fuel sensor or Gm fuel rail. The connections are double o-ring sealed using Viton o-rings. With a positive engaging lock nut, this makes for a very safe way to connect a flex fuel sensor to a factory hard line or fuel rail.