Hayward | J-Box & Wall Mount Pool Lighting Transformers, 300W Hayward Low Voltage Wall Mount Pool Transformer. Voltage Rating: 120 V, 60 Hz, 3A max Input, 12, 13 or 14 VAC Output, 300 W Wattage Weight: 12.0 lbs Enclosure Size: 7 1/4” (19.4 cm) high x 5 1/4” (13.3 cm) wide x 4 1/2” (11.4 cm) deep.  Mounting brackets top and bottom.  Enclosure Type: (A) 0.054” corrosion resistant steel with electrostatically applied white coating.  Knockouts: Total of ten 1/2”-3/4” combination. (4) bottom, (2) right side, (2) left side