Fiber Tubing Coupler is a precision tube used to connect two ST-8 series tubes together.
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Semroc Tubing Coupler ST-8
Had a Centuri Gabriel from the 70's that took some tube damage due to a failed parachute deployment. Was super bummed when I discovered the tube was not any of the standard estes tube sizes I was familiar with. Fortunately, with some guidance, I was directed to the correct tube size and eRockets had what I needed for the current repair and potential future repairs/rebuilds. Worked like a charm. Bought in conjunction with Semroc Body Tube ST-8 18.0".
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ST-8 tubing coupler
These worked great to repair a vintage Centuri kit build after a lawn dart on its first flight.