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Ellcon Models 6600-1 and 6600-2 (60 percent proportioning) and Models 6600-1/50 and 6600-2/50 (50 percent proportioning) empty/load devices sense whether a car is loaded or empty and proportions the brake cylinder pressure accordingly. They feature the following components made of lightweight aluminum: air reservoir, proportional valve and sensor valve. The 6600-1 and 6600-1/50 are interchangeable with downstream, arm-type empty/load devices for all types of cars. The 6600-2 is designed for use where space is limited.