Madcow Rocketry - 4" Tube Coupler

These particular couplers are already thick, and do not need a "stiffy" tube to use to join two 4" Airframes or use internally to reinforce cardboard rocket kits to fly on higher power motors.

These couplers will fit most cardboard kraft 4" airframes including LOC Precision, Binder Design, SBR, and Apogee rocket kits.

These will not fit phenolic or fiberglass tubing without some fitting.