Features: Enhancing oxygenation efficiency in your aquariums with the 6Pcs rubber diaphragm air pumps accessories, design to dispersing fine bubble for improved water quality and fishtanks life health. Use selected rubber and silicone, corrosion resistant, wear proof replacement ensure longlasting performances for great oxygen pump operations. Great for aquariums enthusiasts, fishkeepers, and pet owners searching great upgrades to maintain better oxygen level in freshwater or marine habitats. Perfect for home aquariums, fishtanks, or fishtanks ecosystems requiring consistent aeration to support fish, plant, and better growth. Effortlessly replace worn out component using the universally accessories, engineered to suited most oxygen pump model for seamlessly aquariums air pumps maintenance. Specifications: Component: Rubber Product Dimension: Approx. 01 inner diameter 2.1cm/0.82inch, 02 inner diameter 2.3cm/0.9inch, 03 inner diameter 2.45cm/0.96inch Size: 01/02/03 Package Includes: 6PCS aquariums air pumps Diaphragm note: Please allow 1-2cm error due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color the item.