Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:6223358.

Soap transfer coupler for laundry detergent, fabric softener bottles, or anything else with the same type of thread pitch and size. holds it at a 30 degree angle so it drips back into the new bottle.

Put the captive cap side into the new bottle, and the solid cap side on the one you're transferring from or trying to empty.

Based on the cap by davwilso (thank you for putting your stp file in your thing)