... , non-toxic PVCHigh concentrationAdjustable nose clipRef 413100 non-rebreathing, with 2m anti-crush tubeRef 413200 same as 413100, but without ... oxygen tubeRef 413300 high concentration, with 2m anti-crush tubeRef 413400 same as 413300, but without ... oxygen tubeRef 413500 non-rebreathing with safe vent, with 2m anti-crush tubeRef 413600 same as 413500, but ...