This New Water Trap goes in-line with your oxygen hose. If you are using a humidifier bottle and get those pesky drops of water in your nose, this trap will help stop or reduce it. Your Oxygen hoses attach to either side of the trap, and you lay the trap at the lowest section of your oxygen hose. Gravity will pull the water into the trap. When it gets water in it, simply drain it out, and re-use the trap again!