they're toyota? if so i noticed similar lines painted on some of the air hoses that i bought, i think it just some way the factory marks them as quality control, then again mine only pass air through them and were preform so there wasn't a whole lot a thinking when it came to install, i'd say just put them on and clamp them down since i don't think there is anything in the PS system that would change direction of flow except having the pump hooked up wrong...
ross