RV Pigtails 7 Way To 4 Way Adapter Pop Up Trailers. For Coleman/Starcraft/Aliner Fold down and Pop-up Trailers. Comes in a length that measures to 9 inches. Constructed with high-quality plastic for optimal performance and reliability. Features of RV Pigtails 20020 7 Way To 4 Way Adapter Pop Up Trailers Color: Black 7-way to 4-way adapter Comes in a length of 9 inches Precision construction Package Contents: RV Pigtails 20020 7 Way To 4 Way Adapter Pop Up Trailers RV Pigtails 20020: 7 Way To 4 Way Adapter Pop Up Trailers