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Comparison : Item # 309, 7/16 Inch (in) Inside Diameter Standard Size O-Ring
Item # 310, 1/2 Inch (in) Inside Diameter Standard Size O-Ring
Item # 311, 9/16 Inch (in) Inside Diameter Standard Size O-Ring
Item # 312, 5/8 Inch (in) Inside Diameter Standard Size O-Ring
Item # 313, 11/16 Inch (in) Inside Diameter Standard Size O-Ring