https://backwateraquatics.com/product-category/aquarium-water-pumps/air-pump-accessories/
Air Pump Accessories - Back Water Aquatics
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https://airindustrialworks.com/accessories/?price_min=15&price_max=27&sort=alphaasc
AODD Pump Accessories & Parts | Air Industrial Works
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https://petables.co.uk/product/hitop-single-outlet-aquarium-air-pump-with-accessories-whisper-aerator-silent-oxygen-pump-for-fish-tank-1l-to-100-litres/
HITOP Single Outlet Aquarium Air Pump with Accessories, Whisper Aerator, Silent Oxygen Pump for...
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