Heavy duty Aero Classic 13/500-6 (400-6) TR-87 short bent valve stem tube.
Aero Classic provides more aircraft tubes to the US Military than any other manufacturer. Aero Classic tubes are full size, not stretch to fit.
The ideal tube for any aircraft using a 4.00-6 tire. This is the heavy duty version, which definitely has a higher endurance. Also the 90 degree valve stem makes for easy access on small rims.
GL-4087B / TU 13/500-6HD (400-6) AC TR-87
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