2 Pack 1/4″ Male NPT X 4″ Long Pipe Nipple 3″ Extension Threaded Fitting Brass
While the overall length is 4″, the actual extension between the threads — the unthreaded middle portion — is 3″ in length, providing a 3″ extension between connections when installed. This can fluctuate slightly based on how far the connections are threaded together during installation.