Petzl Zigzag Plus Descender for Arborists - Smooth, Precise Rope

In this review of the Petzl Zigzag Plus Descender for Arborists the bottom line is straightforward: this device is aimed at professional climbers and arborists who need a mechanical Prusik that combines reliable self-locking with smooth, controllable rope feed. The reviewer found the Zigzag Plus particularly valuable for working in trees because its friction chain replicates classic Prusik technique while adding automatic locking and a responsive release lever that gives precise speed control. Customers also report the unit feels genuine and well made, and in our hands it proved durable and easy to use on the ropes it supports.

Key Features

• Intuitive operation: Uses the same technique as a classic Prusik pulley so experienced climbers transition quickly and can rely on familiar movement patterns.
• Automatic locking: The device locks on the rope when the friction chain extends, adding a predictable safety behavior during maneuvers.
• Precise rope feed: A release lever provides smooth, controllable rope feed so the user can adjust pressure to fine-tune descent or positioning.
• Effortless slack takeup: Pulley on sealed ball bearings and separated, curved side plates let slack be removed easily and reduce rope wear.
• Versatile attachment options: Lower swivel attachment keeps the unit aligned and the upper hole accepts the rope end or CHICANE accessory for single-rope use.
• Durable construction: Steel components and separated side plates improve longevity for regular use in abrasive tree environments.

Who It's For

The Zigzag Plus is best for professional arborists, tree workers and serious recreational climbers who regularly move around in trees and need a device that mirrors the classic Prusik system but adds automatic locking and a pulley for easier slack management. Its durability and precise control make it suited to long days aloft where reliability matters.

Those who should look elsewhere include casual users who rarely climb or need a very lightweight, minimalist setup; the Zigzag Plus is purpose-built for rope work and carries features beyond what a simple descender offers. Also, users with ropes outside the 11.5 to 13 mm range should choose a device rated for their rope diameter.

Pros & Cons

Pros

• Reliable automatic locking behavior that mirrors familiar Prusik technique for confidence during movement.
• Smooth, precise rope feed controlled by the release lever for refined position adjustments.
• Durable steel construction and sealed ball-bearing pulley reduce wear and make takeup effortless.
• Versatile for doubled or single rope use with CHICANE compatibility and multiple attachment points.

Cons

• Accepts ropes only in the 11.5 to 13 mm range, so users with thinner or thicker ropes need a different device.
• More feature-rich and heavier than a basic descender, which may be unnecessary for occasional users.

Specifications

Product	Petzl Zigzag Plus mechanical Prusik descender
Rope compatibility	11.5 to 13 mm diameter
Usage modes	Doubled rope or single rope with CHICANE accessory
Attachment points	Lower swivel hole, upper hole for rope end or CHICANE, auxiliary hole for lanyard
Pulley	Mounted on sealed ball bearings for easy slack takeup
Construction	Steel components with separated, curved side plates for durability

Our Verdict

The Zigzag Plus is a practical and robust choice for arborists and climbers who want a mechanical Prusik that behaves like the classic system but adds automatic locking and a smooth pulley for easier movement. It is good value for those needing precision, durability and versatility on 11.5 to 13 mm ropes, though casual users with infrequent rope work may find it heavier and more specialized than necessary.

Frequently Asked Questions

Can the Zigzag Plus be used on a single rope?
Yes. It can be used on a single rope when paired with the CHICANE accessory to increase friction for descent control.

What rope diameters are compatible?
The device is compatible with ropes from 11.5 to 13 mm in diameter.

Does it lock automatically?
Yes. The device locks on the rope automatically once the friction chain extends, mirroring classic Prusik locking behavior.