Reddit reviews Fluval Suction Cups, (4) 4x12 mm and clips, (8) 4x14 mm (03, 04 and 05 Series)
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Replacement clips and suction cups for the Fluval 03/04/05 SeriesEasy to replaceContains four 4x12 mm suction cups and eight 4x14 mm clipsCountry Of Origin: Italy
I think my Fluval 306 and 406 have 1/2” tubing. Maybe these would work for you?
https://www.amazon.com/Fluval-Suction-Cups-4x12-clips/dp/B0002567YQ