Replacement transformer for SST irrigation system. Residential installation. To replace transformers with output of 650 mA or less. Rated at 120 V input and 26.5 V output. Compatible with E-6, ISA-304, ISM4, SST 400i, E-9, ISA-406, ISM6, SST 600i, PC-504, ISA-408, ISM9, SST 900i, PC-506, ISB-409 and STPi Series Rain Bird timer models.