Click on picture above for a closer look.

This device is used with the ABC, MINI, 3F,and MAX Timers to provide positive and effective fuel line pinchoff in conjunction with the timer release post. Typically, the device is mounted on an engine lug close to the needle valve. Machined from aluminum and steel and employing a strong spring-driven pinchoff plunger. The unit weighs only 1.9 grams, including a braided steel hookup cable. Complete with hookup hardware and instructions.

Please note there are two versions of the RPO. The photo link above clearly shows the difference.

Remote Pinch Off. Price: $15.00 ea.
Reverse Remote Pinch Off. Price: $16.00 ea.