Unique Design Provides Extra Leverage When Disconnecting Quick Connect Coupling Air Conditioning and Fuel Lines. Use with 5/16\", 3/8\" or 1/2\" adapters from the Lisle 37000 or 39400 Disconnect Tool Sets. The pliers' forks have different sized openings so the tool can be turned around to fit single or two step collar designed connector lines. The pliers can also be used to reconnect stubborn lines or connections that are in hard-to-reach areas.