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You will need a piece of pipe about 2" to 3"long that will fit inside the diameter of the two heater hoses at the firewall and two hose clamps. (1)disconnect the two hoses at the firewall; (2)slip a clamp on each hose; (3)slip the piece of pipe into both hose ends to connect the two hoses together; (4)install and tighten clamps on each end of hoses over pipe. (You might want to put a little grease on the pipe for easier removal when you are ready to install new core.) Unbolt and remove old heater core. It will be easier coming out than the new one going in, trust me. Once you have the new one in, unclamp the hoses and attach them to the new heater core.  Start engine and check for leaks at the connections.