Profile: S S I Custom Plastics deals with thermoforming and CNC milling machines. Our product line includes rod boxes, pilling caps, showers, mast boots, fire extinguisher boxes and access doors. We offer shower power box, pedestal winch handle holders, diverter valves, binocular cases and glove storage boxes. Our access door line includes single wall and deluxe double wall. We distribute compact double drink holder and deluxe single holder packets.