The refrigeration compressor is created to compress vapor just. A suction line collector avoids compressor damage from an abrupt rise of liquid refrigerant and oil that might go into the compressor from the suction line. The suction line accumulator is a temporary storage tank for this mix, developed to meter both the liquid refrigerant and oil back to the compressor at an appropriate rate. This avoids damage to the reed valves, pistons, rods, and crankshafts. Collectors have a metering ejector gadget that gets liquid, vaporizes it, and returns it to the compressor. This avoids liquid slugging and manages oil return. It is specifically essential on hot gas defrost systems, heat pumps, etc., where rises of liquid refrigerant regularly return down the suction line.