RANSBURG TR SSMM 148 Weeping MVR Assembly 2 stage This Graco 194380 Center Housing 4 1 2'' (114 mm) This Graco 194380 Center Housing is a genuine replacement part that includes the components listed as Ref 16 and Ref 17 in the parts manual Italy) in the parts manual's exploded diagram #2 Needle Low Flow (TR SSMM 149) #3 Needle Medium Flow (TR SSMM 150) #4 Needle High Flow (TR SSMM 226) Ports: Top and Side Air Ports: 1 8 27 NPT (F) Fluid Inlet & Oulet Ports: 3 8 BSP Threads Bottom Weep Port: 3 8 18 NPT (F) Mounting Holes: 5 16 18 Control of the MVR is achieved through an air pressure control signal generated from the transducer panel