Blagdon Powersafe Pond SwitchBox 3 / 4 / 5 Garden Waterproof Electrical Supply

Designed for safe pond-side and garden electrical connections. 3 Switch unit: 2 individually fused power outlets for up to 1 x 1000W, plus 2 x 300W total unit capacity. 4 Switch Unit: 2 individually fused power outlets for up to 1 x 1000W, plus 3 x 300W total unit capacity.

eBay