We can almost guarantee you will need to deal with an NPT fitting on your homebuilt before your project is finished!
Nearly every device on your homebuilt aircraft that touches fuel or brake fluid will require a fitting for attaching hoses or rigid lines to them. These fittings need to be sized properly and installed correctly. The NPT standard (National Pipe Thread taper) determines the criteria you need to know for selecting the proper size.
In this short video, we will convey the basic knowledge of this thread standard so you can feel confident in selecting the correct fittings and order the right sizes from your aviation parts supplier. The video shows how to properly determine the existing size of a fitting - NOT an intuitive procedure if you are new to these items!