The Petzl Zigzag Plus Mechanical Prusik Pulley is a progression device that works like the classical Prusik pulley system for tree care work using double rope. The friction chain on the Mechanical Prusik Pulley works just like the classic Prusik knot. When the rope extends, the friction chain locks into place. The pulley is mounted on sealed ball bearings to adjust rope slack easily. Like the original Zigzag, the Petzl Zigzag Plus Mechanical Prusik Pulley is compatible for ropes with 11.5mm to 13mm diameter. The difference between the two is that the Zigzag Plus is beefier and has an additional attachment point.
Just like the original Zigzag, climbing and descending is smooth with the Zigzag Plus' easy rope feed, while braking is precise with the release lever on the friction chain. The pulley is mounted on sealed bearings, and side plates are curved and separated, so rope slack is easily adjusted. The Zigzag Plus Mechanical Prusik Descender can work with weight up to 320 lbs. To use this ZigZag Plus with a single rope, use with the Petzl Chicane Auxiliary Brake (sold separately).