Vatac Marine Shipbuilding Bronze Fuel Oil Tank Self-Closing Drain Valve are designed and manufactured strictly to standards if JIS F7398,Website:://.vatacvalve.net, The Self-closing Drain valves supplied by Vatac are mainly offerred in U and F two styles. Pressures from 5K thru 10K, Operated by Lever or Push Button.Vatac self closing valves are available with metal or soft sealing. The self closing valve is closed automatically when the lever or push button is released, meaning that there is no risk of the valve being left open by mistake if someone is interrupted during operation. The static pressure in the tank or the head in the system in cooperation with the spring closes all self closing valves.Standards Compliance» Design