When replacing the control box on a Zap Series 1 and 2 Control boxes you must use a series 3 control box. The ZAP PCRP allows the older operator to be UL325 compliant. This adapter has four holes with a built in resister that allows users to install photo eye.
PLEASE NOTE: This plug cannot be used on complete Series 3 operators. Only when replacing the control box on an older zap