Eheim O-Ring 2217 API The uniquely shaped disc that

The uniquely shaped disc that sinks rapidly while retaining its shape longer than the competition

Featuring a drawstring top allows for easy access

Great for freshwater

the unit should be read under natural daylight or daylight simulating light

and helps resolve algae blooms

Eheim O-Ring 2217 API The uniquely shaped disc thatEheim 2217 Sealing O Ring (1pk) The Eheim filter seals can become loose over time and will need to be replaced to ensure the filter seals correctly We recommend replacing the Eheim main sealing gasket once a year to prevent leaks Fits Filters 2032, 2034, 2036 Easy to replace Replace as needed Genuine Eheim spare part