This adapter will couple firmly to the 079-00300 (FC-6446) type bleeder screw used in Cleveland and Matco brake systems so that you can properly bleed and charge the aircraft's brake lines and cylinder. It has a quick-connect coupler at the other end, which will work with all bleeder tanks (such as our model 225 Economy Bleeder Tank) or other pressurized fluid systems. The offset design allows the hose to clear the wheel hub when connecting to bleeder tank. It locks firmly in place around the nipple and forms a high-pressure seal, so there is absolutely no chance of leaking fluid.