This adapter is designed to fit the same bottle thread adapter of the standard model, but adds a barb that fits a 16mm inner diameter of a standard garden hose. Prints simply with a brim, no supports required. Thread the part into the urinal bottom with some silicone sealant, and tighten with a hose clamp.

I ended up wanting this for a bathroom remodel where I had a functional waste stack but wanted something temporary while I was working in there. Enjoy!