RE57314 Coupler Socket To Compressor Line Fits John Deere Tractor 4230 4430 4630One New Aftermarket Replacement Air Conditioning Return Quick Coupler Socket to Compressor Line Fits John Deere Tractors This aftermarket replacement RE57314 air conditioning return quick coupler socket to compressor line is part of the A C refrigerant circuit on Fits John Deere 40 series row crop tractors. It connects the return quick coupler socket to the A C compressor and carries refrigerant through the air conditioning system. Compatible Models