DXc extension Box increases the enclosure size of a DXc1, DXc2, or DXc4 control panel to accommodate larger batteries, relays or other equipment by fitting the extension back box, 263 x 390 x 147 (H x W x D).This Extension Box is supplied without covers. Two covers must be used with the box. Any combination of the three listed below can be used: 795-101, 795-103, 795-116