The product description says it fits 24mm flanges but for me this product was too much to create a large cross section and the silicone insert seems to be too tight being small to fit 24mm flanges I tried it and my mother was happy with S12. And even in my spectrum S2 24mm flanges and they didn't fit. I was very disappointed with this product, just spend the extra money and order the flange inserts you need direct from your pump manufacturer's website
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