Guardian GUDT-304 DC GDO Position Encoder Pre 2/12 Garage Door Openers
DC GDO Position Encoder Pre 2/12
In order to identify whether your operator was manufactured before February 2012 customers need to locate the steel chassis of the opener. Here customers will find a barcode label with a serial number. If your serial number is lower that 12020001, then this encoder will work for you.