Here's a first - Treemagineers pulley compatible with Petzl
Richard Tregoweth, Sunday, May 08, 2011

In most instances Treemagineers inspired hardware works best with other DMM products. When Treemagineers gear is paired with other brands they don't seem to work as well. eg the Ultra O with the Hitch Climber is a perfect combination but when you combine the Petzl OK (supposedly oval) carabiner with Hitch ..