Fits BT-80 & BTH-80 tube

Estes Flying Model Rocket Part Tube Couplers for BT-80 Body Tube 3" long(2pk) EST 3178

Estes Accessory Model Rocket Tube Couplers for BT-80 Body Tube 3" long(2pk) 3178 Includes: 2- BT-80 …

Estes Flying Model Rocket Part Tube Coupler for BT-55, 56, 60, 80 EST 3196

Estes Accessory Model Rocket Tube Coupler for BT-55, 56, 60, 80 3196 Includes: 2- BT-55 2- BT-56 2- …

Semroc Tubing Coupler BT-80 1.0" Long SEM-JT-80C

Semroc Tubing Coupler BT-80 1.0" Long   SEM-JT-80C Spiral Wound Rice Paper Coupler is a pr…

Semroc Balsa Nose Block or Coupler BT-80, 3.2" Long SEM-NB-80

Semroc Balsa Nose Block or Coupler BT-80, 3.2"   SEM-NB-80 Precision Turned Balsa Made in …

Semroc Coupler CPL-80-4"(1pk)(similar to JT-80E) SEM-CPL-80-4

Semroc Coupler CPL-80-4"(1pk)(similar to JT-80E)  SEM-CPL-80-4 Wound Kraft Paper Same diameter…