2581B-50 Mech Pumps Overview Welch Dry Pumps Product Detail (Click to Enlarge) Overview New Dry Piston Pump with Regulator, Welch WOB-L, 3.5 CFM, 5 Torr Base Pressure, 0.33 hp Motor, 1/4 NPT Inlet with hose barb or NW25, specify at time of order, 30# Weight Order Part INQUIRE View Cart