ガス栓せんMeanings1noungas tap; gas cockA valve or stopcock for controlling the flow of gas, typically found on gas appliances or pipes.ガス栓せんを閉しめてから掃そう除じを始はじめてください。Please close the gas tap before starting to clean.地じ震しんのときはすぐにガス栓せんを閉しめましょう。In an earthquake, let's close the gas cock immediately.