Modular water fountain head/nozzle for 13mm (1/2 in) tubing

This is a set of output nozzles to fit 13 mm (1/2 in) tubing.

The core part, **Universal 13 mm fitting**, attaches to the tubing, and all of the other items marked `Cap` fit onto it. The caps are:

1. **Cap - Dome** (pictured above) creates a sheet of water that mushrooms outwards. `Outer casing` fits onto the universal fitting, and then `Reflector` fits inside that. The two pieces are joined by a 3 mm rod (I use a bamboo skewer) with a friction fit. Set it up so that the reflector is highe