Our 1/2" Steampunk Stop Valve cycles through On/Off in a clockwise direction each quarter turn. The Red wire passes thru while the Black wire connects to the switch and passes thru as well. Switch handles 3amps at 120volts or 5amps at 12volts. The valve is very easy to install and incorporate into your Steampunk/Industrial lamp project. NOTE: handle color may be red or green. We send randomly red handled or green handled light switches. Size: 1/2. PLEASE measure the size you need to exclude ordering by mistake. All items are shipped from our New Jersey facility via USPS Priority Mail.