This is a simple wall mount bracket for rather common 26mm (~ 1 inch) diameter plumbing manifolds.
If you have a slightly different manifold diameter, just scale it a bit.
As it is open-source, you can also modify the whole thing:
* The bracket's profile can be modified in the LibreCAD .DXF file.
* The screws holes and positions can be modified in the OpenSCAD .SCAD file.
Feel free to use and share this design. Good design is hard work, donations are welcome.