SPARE SEAT COUPLER KIT (BIT ATTACHED TO ADULTS  BIKE) FOR ETC TOWBUDDY TAG A LONG ADULT TO KIDS BIKE TANDEM ATTACHMENT NEW AND BOXED. THANKS FOR LOOKING, PLEASE SEE MY OTHER ITEMS INC COMPLETE TOWBUDDYS AND SPARE RECEIVER KITS. POST FREE IF ORDERED WITH TOWBUDDY. SPARE COUPLER GREAT IF 2 ADULTS 1 CHILD, SPARE RECEIVER GREAT IF 1 ADULT 2 KIDS. POSTAGE DISCOUNT FOR MULTIPLE PURCHASES, LOCAL COLLECTION ALWAYS WELCOME