Pipe lamp switch. It fits any 1/2 inch standard thread pipe, or larger diameter if you reduce it down. It's a rotary switch. Turn the valve to the right for off/on. International buyers, note that switch is listed for 125v.This switch can be placed anywhere on your pipe lamp. No need for an inline valve switch. Just fit it into a tee or elbow fitting. The options are endless for desk style or stand-up style pipe lamps. I have made numerous styles and looks of industrial style pipe lamps incorporating this switch. You can let your imagination go wild in your design. This switch will fit.I have a couple of lamps posted. Look at them to get ideas.