which type of carabiners do i use to connect...
which type of carabiners do i use to connect a petzl croll to my petzl navaho bod harness.
I would probably go with a Petzl OK locking biner. The classic oval shape helps everything sit right when weighting and unweighting.
I would strongly recomend the use of a Maillon Rapide. Carabiners attached at the harness can easily be crossloaded as they become entangled in all the clutter of your attachment point. Rapieds are rated full strength in all directions and are the preferred attachment method. Also there the efficiency of an ascending system like the Frog system is impacted by how low the Croll is attached to the harness. Rapide's offer the the most compact attachment method for these systems.