• These replacement diaphragms fit both PA 2 and PA 4 models. 
• PA 2 models have (1) diaphragm.
• PA 4 models have (2) diaphragms.
• Diaphragms should be replaced every 1 to 2 years or as needed. 
• Consider replacing your air stones as well to get the maximum air flow into your pond.
• Includes written instructions on how to replace the diaphragm -- or just watch our video below!

Watch the video below to see how to replace your pond aerator diaphragms!