Push one heavy load while pulling another. These hydraulic cylinders have a rod that runs through both ends, so when it extends on one end, it retracts on the other. Built with a small body, they'll fit in tight spaces but operate with similar force to standard-sized hydraulic cylinders. This is in large part thanks to their two hydraulic ports: one port to extend the rod and another port to retract it. That means no matter which direction they're moving, they're giving it the same amount of power.

The piston is magnetic, so you can use these cylinders with sensors (sold separately) to activate relays and controllers. When the piston moves past a sensor, the sensor activates. You can use multiple sensors—one for each action you want to trigger.