Eccentric reducer coupling
       I.D. (mm)              Wall Thickness (mm)                Application            
63-40 3 B
63-50 3 B
90-63 3 BD
110-63 3.2 BD
110-90 3.2 BD
125-110 3.2 BD
160-110 4 BD

B: Inside the building
BD: Inside the building or under ground within the building structure