Bi-directional bottle coupler for draining

If you use pump bottles, you will reach a point where the pump cannot draw up the last bits of the product. You may want to drain the remnants into a new bottle to reduce wastage. With this print, you can couple two bottles together to drain one into the other. That was my opening spiel from. https://www.thingiverse.com/thing:7261872 At the end, I found my better half disregarding the directional arrows and the very obvious spout direction, resulting in soap dribbling from the breather hole and making a mess on the countertop. So here is a possible solution. No breather hole, no direction. As you can see from the section view, there is a taper to draw the soap or shampoo to the center of the coupler in hopes that no product will accumulate at the threads of the receiving bottle and leak out. As before, these couplers have threads for the large 1-litre soap bottles and will accept the thread adapters from that other bottle coupler, so all thread sizes should be covered. Print in PLA or PETG. Support not required. Use brim to anchor the part to the print bed.