Blue Diamond Pumps SKET 60 Service Kit For Models ET/ETA/ETK 60 Aerator Pump – Keep Your Linear Diaphragm Pump Performing For Your Hydroponic Growing, Fish Pond Aeration, or Septic System Aerator Price: $54.14 (as of 01/12/2023 19:20 PST- Details)

COMPONENTS: this pump kit contains 2 diaphragms and 1 magnet. Diaphragm measures 2 3/8 inches.