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Comments about OBP Weld-On Aluminum Filler Neck with Cap, 50mm OD:
I needed a gas cap with matching filler neck for my custom aluminum gas tank and this fits the bill perfectly. The rubber "o-ring" in the cap seals well and the neck is long enough to modify or not. I also rounded the cap upper edge a little to remove the notchy, somewhat sharp edge. It is by no means sharp like it would cut your hand but I wanted something a little rounder and smoother without the sharp edge.
Works great and couldn't be happier. I have a second one for the next project bike. I know this is probably meant more for a car but why be limiting in application? If you're a fabricator and looking for a nice filler neck and gas cap this would be it.