I'm pretty sure I don't need one. I'm not supposed to over fill the reservoir (or boil the fluid). I'm supposed to cover the bike before opening the reservoir. I try not to ride upside down, and if I do, brake fluid is the least of my worries. I'm supposed to change out the brake fluid before it discolors or breaks down. Of course, now I want one... Do they have them in flat black? edit: Yeah.... ok, if I run across a Resident Evil, Zelda, or Chicken Fett wrist band, I'm buying it...