Philmac Threaded Bushing – 1" x 3/4" | Step Down from 1" to 3/4" Thread in One Fitting The Philmac Threaded Bushing 1" x 3/4" is a hex bushing that reduces a 1" female threaded (FNPT) fitting down to a 3/4" male threaded (MNPT) connection. It’s the simple, reliable solution for connecting 3/4" valves, fittings, or equipment to 1" threaded ...