IP55 connection box, 2-pack 1 piece junction box for 2-way cable diameter 6-8 mm spoke (IP55, 3-pin black connectors ,,,, open air outdoor waterproof cable, package 1 piece)
Permety plugging an electrical input to 2 outputs; seems waterproof and simple to use. The only restriction to multiply the connections somewhat deterrent price of this yet very practical purpose.