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Cylindrical sponges cover the inflow holes of filter pipes to prevent tiny animals from getting sucked in and trap particles and debris. They also function as small bio filters.
Small: 1 cm inner diameter, 2" length
Medium: 1.5 cm inner diameter, 2.75" length
Large: 2 cm inner diameter, 3" length
The sponges stretch so they should work for pipes that are +/- 5mm from the inner diameter of the sponge.
United StatesIt covers my filter intake perfectly, and even has the end covered to prevent anything from the bottom to come in, and perfect for the price.
