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:
To Install you should put silicon sealant on the back of the Metal part and gently push it into place. Also the rubber part can use a light coat of silicon to slide it into place in the impeller.
Please note: When you have a seal leaking in most cases you will need an impeller because the leak caused water to get into the metal shaft area that the impeller is screwed onto and expands and damages the impeller. The Hot Tub Professor offers How To Installation Videos on Seals and Impellers.
