AES Industries 203 Brass 1/4" NPT In-Line Air Pressure / Flow Regulator INCREASE OR DECREASE pressure in seconds as the tool or job dictates. EASILY installs "in-line" at your pneumatic tools air inlet for convenient air flow adjustment. KNURLED adjustment knob rotates smoothly from closed "0" position to fully open "MAX" position for quick and easy air flow adjustment. LIGHTWEIGHT brass construction is rust and corrosion resistant. SPECIFICATIONS: Air Inlet & Outlet: 1/4" NPT