Aquatec CDP6800 wire and tapes:

The holes on the transformer are mounting holes. You can use these holes to mount the transformer on a
bracket or plate. This transformer is UL listed.

The tape on the wire nut is only for illustration, so you can see how that are connected and you can easily disconnect for other wiring options or if you don't need to use the pressure switch or the solenoid valve.

You need to assemble the wires yourself. Just like the photo we have on the listing, all components are not connected.

Many people purchase this item for different types of setup so the clear tape is just temporarily holding the wire nut together.