The Touring Double is compatible with all of our leashes and bungees, transforming them into a Y-leash. The coupler will not twist and tangle when you use our leashes with a spinning carabiner. The long “arms” on Touring Double straighten the angle so that the dog’s harness maintains a centered load. Touring Double comes in two sizes. Small with ultra-light aluminum carabiners. Medium with Twistlock carabiners, these have an automatic lock assuring that the dog does not get loose.