Aosom Type 'B' Bicycle Trailer Hitch Coupler For use with certain models of Aosom brand trailers only, we cannot guarantee functionality with other brands This hitch is a great item to have to make switching your bike trailer among various bicycles quick and easy For use on Aosom bike trailer models B4-0005, B4-0006, B4-0007, B4-0008, B4-0021, B4-022/23, 61-0001, and 61-0002