Piston u-seal that is designed to seal on the outside diameter of the seal.
RUS-90URE-2×2-3/8×1/4
RUS-90URE-1-1/8×1-5/8×1/4
RUS-90URE-2×2-1/2×1/4
RUS-90URE-2-1/8×2-5/8×3/8
RUS-90URE-4-1/2×5-1/8×3/8