Comparison : Item # 666-006, 1/4 inch Nominal O.D. and 1/8 inch Nominal I.D. U-Cup
Item # 666-008, 5/16 inch Nominal O.D. and 3/16 inch Nominal I.D. U-Cup
Item # 666-010, 3/8 inch Nominal O.D. and 1/4 inch Nominal I.D. U-Cup
Item # 666-011, 7/16 inch Nominal O.D. and 5/16 inch Nominal I.D. U-Cup
Item # 666-012, 1/2 inch Nominal O.D. and 3/8 inch Nominal I.D. U-Cup


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