FLEX AIR PIN BOX 21K

King Pin Coupler; 21000 Pound Gross Weight Capacity; Air Ride™ Technology Pin Box; With Rota-Flex® Pivoting Head/ Air Bag/ Rubberized Compound/ Oil Shock; With Ten 5/8 Inch-11 Grade 5 Bolts/ Ten 5/8 Inch x 1-3/4 Inch Flat Washers/ Ten 5/8 Inch Lock Washers/ Ten 5/8 Inch-11 Hex Grade 5 Nuts; Only Compatible With Rhino™ Box Pin Box Designs