50 Pound, Dot Class- 4BA400, 3/4in. NPT Plug- YES, Float Switch- NO, Water Capacity- 47.7 Pounds, Tare Weight- 28 Pounds. DOT Classified for recovery, recycling, service and reclaim. Liquid and vapor valves (Y valve or separate valve configurations) are installed in all cylinders. Painted yellow/gray per ARI guidelines. Float switches have 3-pin Brad Harrison connectors. Caution - Never overfill cylinders. Maximum refrigerant capacity is limited to 80% of the water capacity of the cylinder in lbs. DOT requires cylinders to be retested every five years. Some recovery equipment uses weight scales to cut-off refrigera nt fill at 80% of capacity. Be sure cylinder tare weight is correct for this type of equipment. DOT classification example 4BA400 - 400 PSI working pressure, 800 PSI test pressure (double the working pressure), 1600 PSI minimum burst pressure (double the test pressure). Pressure relief/safety valve is set to release at between 75 to 100% of the test pressure. For example, in the 4BA400 tanks which have a 800 PSI test pressure, the relief valve opens at between 600 PSI and 800 PSI.