Unsupported browser

You are using an outdated browser. Please upgrade your browser to improve your experience.

Sign up for an Award

Participate with your entry in one of our professional or student awards.

Sign up for an award

Sign up for a Profile

Create your own profile and publish it in the iF WORLD DESIGN GUIDE.

Sign up for a profile

Learn more:

iF SOCIAL IMPACT PRIZE (free of charge)

Present your project for free and win your share of EUR 50,000 in prize money.

Publish your project

green = safe / gas valves

green = safe

You should see if a gas valve lies vertical or horizontal to confirm it locked down. But
people sometimes confused. This could be led to a horrible disaster. “Green = safe”
guarantees safe gas usage by changing valve color in accordance of valve status.



Seoul, South Korea



Seoul, South Korea

Hwa Shin Lee