I have a pair of Dayton 1/2" filter/regulators that I'm using. They're working fine. I run full compressor pressure to them, 165psi, and keep them set at 90psi out. I bought them through Grainger. Had to buy the pressure gauge separately, also from Grainger. Like most things, I think there are multiple grades of the Dayton stuff. The ones I bought are all metal except for the knob on top. The reservoir is cast aluminum and has a sight glass.