Location of the Golden Pipe Wrench in the Lighthouse
You will need to head to the lighthouse to find this first key. It is located at the very top of the lighthouse where the lantern rotates. Don't forget to land on top of him because running up the spiral staircase is a long one. The coordinates are C1, and it's directly east of Shark. If you are playing on normal mode, you can head to the Shark and jump into the Choppu helicopter that is there to fly further.
Fortnite Steam Stack in Cooling Towers
This wrench is right in front of the building on the east side of the Giant Cooling Towers in H2. It's directly north of the southernmost chimney in the area, and above the big green chimney. It's pretty hard to reach unless you land on top of the pipe, so you might need some resources to get to it.
Fortnite Dock Golden Pipe Key
The third location can be found in the center of the Dirty Dock at coordinates H4 on the map. It is located in a remote area in the western part of the location. You need to go down into the mud and take the wrench that is under the pipe.
Fortnite Iron Man Gold Wrench
Another famous landmark that can be found on the map is the Pipeman! This statue of a man welded from metal pipes is moving away from its original location and heading west. You can currently find it at D8 on the map, which is very far south and not really in range of any of the named locations. Pipeman is quite large, so it will be hard for you to miss him. The wrench is in one of his hands, so either land on it or line up.
Location of the Fortnite Golden Pipe Wrench
The final key for the golden pipes can be found in Shack Town, which is located at B6 on the map. It's right in the middle of the area and is under the trumpet statue that exists there, which is apparently worshipped.