Brand new 1-1/2" NPT industrial grade compressed air pressure regulator with high quality 300 PSI liquid filled air pressure gauge.This regulator has a max pressure of 300 PSI and will regulate your air pressure anywhere from 0 PSI up to 250 PSI. The adjustable turn knob makes adjusting your pressure very easy. This regulator features a durable zinc body and a balanced valve design. This is a directional flow regulator that has an arrow on the bottom showing what direction the air needs to flow. There are 1-1/2" female NPT threads (measure 1-3/4" diameter) on each side for your main compressed air line and 1/4" threads on the outer sides for your gauge to go on either side and there is a plug to fill whichever side you don't use.