Notice that you need to download the RAR-file and print all parts separately. I don't know how well it works to print the entire assembly at the same time. It might work on a Powder Bed Fusion printer, but it would be really hard in a regular FDM printer.
The tap attachment might not fit on your tap, it is specificly made to fit on my tap and I don't know which standards there are in the tap industry. A tip would be to measure your tap before the print, so it's size isn't completly wrong.
The outside diameter of the threds on my tap is about 21.5 mm, and the pitch is about 1 mm. If your tap is in about the same size as mine and doesn't fit, you could try the other sizes of tap attachments that I've included in the RAR-file.
When the print is done, you simply attach a dish brush on the thing with cable ties, and you are ready to go!