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.
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