90 Degree Elbow Fitting for Schedule 40 PVC Pipe (FIPT x FIPT) Sometimes you need to connect two pipes together that are making a bend or a turn, but the two pipes have threaded ends on them so a slip elbow won't work. If the two ends of the pipe you are joining are threaded, you would use a Fipt elbow or threaded elbow. The abbreviation FIPT simply stands for female inside pipe thread and it means that the elbow or ell has female threads inside both sides. If the pipes needing to be joined form a 90 degree angle or turn, you would use a 90 degree FIPT elbow. Both threaded pipe ends are screwed into the ell, forming a 90 degree turn or joint. All of our Schedule 40 fittings are NSF rated 14 & 61, which means they are certified for use with potable (drinking) water. Maximum temperature is 140 degrees F.