Get current pricing for Robbins, ROBBINS-6311-ID Robbins / Meyers Moyno Progressing Cavity Pumps. Suction Housing = 3 Flanged Inlet, Reducer = 2-1/2 Screwed Outlet, Frame: 2 L 6 (2 = 2 Stage, L = M . Product Category: Lab Equipment, Sub Category: Vacuum Pumps: