Yea It is the balancer from Great Planes. I really like it, I didn't think i needed one until i watched one of our club members balance his plane with his fingers, then proceed to be way too tail heavy, which resulted in a spectacular crash. I instantly ran out and got me one after that, and have been happy with it so far.

@Missleman... Yea i didn't catch that at first, but I have since rotated up to the top, and sealed the exposed wood around the valve. Much better now,