Tetra quick release is an adapter that is attached by the hub of the rear wheel and holds in the release button when removing the wheel.
Users comments
Used for purposes such as riding in a car, when the user lifts the wheelchair into the car, see spinalistips.se/en/tip-lifting-the-wheelchair-into-the-car
Purchased from
Panthera, Etac, panthera.se/index_en (last checked June 2020)