This nickel plated steel muffler can be used for gear boxes and valve ports.10-32 UNF threads and 1/16”, 1/8”, 1/4″, 3/8”, 1/2″, 3/4″ and 1” male NPT threads with a standard 40 micron sintered Bronze filter. 10 or 90 microns optional. Also available with female 1/8”, 1/4″, 3/8” and 1/2″ NPT threads. The operating pressure is 300 psi and the working temperature range is 35˚ F to 300˚ F.