specification for oxygen gas cylinder Model:WMA219-40-15 Water capacity:40L Height:1500 Weight:52kg Working pressure:15Mpa Testing pressure:25Mpa Wallthickness:5.7mm Material:37MN Model:WMA219-50-15 Water capacity:50L Height:1710 Weight:59kg Working pressure:15Mpa Testing pressure:25Mpa Wallthickness:5.7mm Material:37MN