SOLBERG PS-04-025 Filter/Silencer, Inlet. More details: Air Compressor Filter/Silencer, (M)NPT Outlet (In.) 1/4, Outlet (In.) 1/4 (M)NPT, Max. Flow (CFM) 4, Filter Rating (Microns) 2, Paper Filter Media, Filter Efficiency ( Percent) 99, Temp. Range (F) -15 to 220, Plastic Housing Material, Height (In.) 2-1/4, Nipple Length (In.) 1/2, Dia. (In.) 2-5/8, Silencer Tube Design