​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​This high-performance, single rotary seal is capable of addressing a wide variety of applications. 
The Chesterton ​491 can be run against many different stationary seal rings for maximum flexibility in many applications. The non-fretting design will not destroy the shaft sleeve or any metal parts. The 491 has a balanced O-Ring design with anti-clog features, springs out of the fluid, dynamic O-Ring moves on a clean surface.