A coupling device for a recreational structure comprises a first arm member and a second arm member. The first arm member comprises first and second ends that are arranged substantially in a plane. The first end comprises an external surface that is capable of receiving an internal surface of a first horizontal frame member of the recreational structure and the second end comprising either an external surface that is capable of receiving one of an internal surface of a second horizontal frame member of the recreational structure or an internal surface that is capable of receiving an external surface of the second horizontal frame member of the recreational structure. The second arm member is arranged along a longitudinal axis and is capable of receiving a vertical frame member of the recreational structure.