To Install these Assets:

Blender Asset Browser

these are in the folder BABPipeJoint copy this folder to where you store your normal Assets for blender.

2 Options need adjustment when using them as they are made of several parts they had to be stored as collections.

this needs unchecking you only have to do it once after you add your first Pipe

And Follow Preferences needs to be set to Append

Blender Asset Management Addon

If your using the "Blender Asset Management Addon" follow these steps to add the pipe assets to your library.

Extract the zip file and place the Folder called "PipeJoints" in the path of your Asset_Library inside the "Scene" Folder or a Folder of your choice if you have another.

If you don't own the "Blender Asset Management Addon" you can still use them as each blend file contains one or a collection of connected parts.

To use the PipeJoint Assets:

alternatively watch the video to see how its done

To change materials:

most parts come with 2 or more subobjects these can be selected and the material change if you want to move rotate the main object make sure you select the top level parent.