The FAAC 844 Slide Gate Operator comes in two versions, rack and pinion and chain driven. This is an ideal operator for commercial or industrial use that will handle a maximum weight of 4,000 lbs. It can be outfitted with two different options of pinions for either racks or chain. This operator has a magnetic limit switch, adjustable mounting brackets for easier installation, no locking devices needed, and display buttons for programming.
So if you have a a very long gate( up to 131 ft) that weighs 4,000 lbs or less, choosing this operator is a no brainier.