Bottle 2 Bottle Drainer

I wanted to make it easier to drain the leftovers of bottles. The options already available were very complex for what was required. I reduced it to its most basic needs, a male end, a female end and a ridge to help the top bottle stay in the socket. I may revisit to improve the seating of the upper bottle, but if you drain it against a wall, it should compensate for the shifting of liquids. Was originally made for conditioner and shampoo bottles as it can take an entire day for gravity to empty one into the other. 

No support required.