The Length Extinction Kit is designed for those who need longer enclosures. Two 4’x2’x2′ enclosures can be connected to create a 8’x2’x2′ enclosure. Connect a 4’x2’x2′ enclosure and a 2’x2’x2′ enclosure and create a 6’x2’x2′ enclosure. NOTE: not compatible with the Meridian Enclosures.