This part is a Kit that features (1) Seal, Seal Tool and Silicon that fit (8) Mount Style Piranha, Thera-Flo, Thera-Max pumps and The Professor's Silly Juice to seal the seal. It is 1 3/8" Across the back of the Spring Seal part that goes onto the Impeller and the Ceramic & Rubber part that goes into the Volute or Wet End Back is 1 3/8". The Hole in both parts is about 3/4".
Note: This Kit fits the (8) Mount style wet end back with a 1 3/8" Hole in it.. There is a similar wet end with a (4) Mount back that uses a different seal and parts kit with an outside measurement of 1 1/4" for those parts click below:
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