Semroc Coupler CPL-60 Screw Together(2pcs)  SEM-CPL-60-3DS

1 set to combine two pieces of BT-60 Body Tube together

Each set includes 1 male and 1 female threaded piece

One side includes a valley and hold to thread Kevlar through for a shock cord

Bumper to keep the pieces from going too far inside the body tubes, Glue with model cement or Epoxy

Great for assembling long rockets that need to be disassembled for transport