Pump Cup Leather 1-11/16x5/8 Plastic and wax impregnated oak-tan leather cups for regular service. No.3X2 - Use with #2 Pitcher Pump for 3" Cylinder. No.31/2X21/4 - Use with #3 Pitcher Pump for 31/2" Cylinder. PUMP LEATHER CUPS O.D. x I.D. Ins.=1-11/16 x 5/8 , EA