Many thanks guys, pretty good reasoning. Decided to go with the 4mm to 6mm manual fuel shutoff valve as suggested by Felker14 from DreamWorks. This way, I do not have to change out the 6mm outlet UAT. ArtARRO, the Bee came with a 4mm manual valve but the UAT has a 6mm outlet. With the shutoff valve from DreamWorks, removing the 6mm shutoff valve and installing the new valve is all I will have to do. Run the line from the UAT (6mm) to one side of the valve and run the 4mm line out the other side to the filter. Thanks everyone. Chic