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https://www.swelluk.com:443/swell-pond-air-pump-replacement-diaphragm/ 
Swell Pond Air Pump Replacement Diaphragm
Replacement Diaphragm for the Swell Pond Air Pumps, for models 270, 450 and 900.
Products
Product Information
Diaphragms are a moving part within the Pond Air Pump and over time will stretch and can split, reducing the output of the air pump. They are made from a silicone rubber for excellent reliability and life expectancy but will eventually need replacing.
Diaphragms are a moving part of the product and are not covered under warranty.
Imagines indicate the three options available