These were screen printed with the fuel tanks marked back when the boats were new. Over the years we have seen some outside or well used baots which have had the markings worn off by UV and weather.It wont matter much on a P2 as long as you have one side pulling, then mark that valve for your boat, and then flip it over to the other side as suggested, and mark that vavle with a sharpie marker. Just go ahead and relabel the valve when you have time, after you figure out your sequence. There are a short amount of valves different than others, though we dont recall which ones? BCB