ガス栓[gasusen] gas tap
音栓[onsen] organ stop
給水栓[kyuusuisen] hydrant
共栓[tomosen] stopper
共同水栓[kyoudousuisen] common faucet

元栓[motosen] stopcock (gas, water)
塞栓[sokusen] embolus
耳栓[mimisen] earplug (for protection against noise or water)
消火栓[shoukasen] fire hydrant
水道栓[suidousen] hydrant