Please give us the dimensions of the seal.
Tommy B. for Model Number Oster Blender PST2a291-72
Answer Tommy, the blender insert seal 9704204 is approx 3" in diameter. Thanks!
I am needing a coupling for this blender! Serial # wj3492087.
Connie for Model Number KSB5WW3
Answer Hello Connie! According to your model the coupler is part number 9703274. Unfortunately, this item has been discontinued and is no longer available for purchase. Sorry about that!