The AquaClear Powerhead Adapter allows you to securely attach a Powerhead to the stems, The adapter eliminates water bypass and provides additional support, ensuring that your Powerhead works properly, The AquaClear Powerhead Adapter Features and Benefits:, - Quick and easy installation, - Secures Power Head to stem, - Eliminates water by-pass, - Fits stem diameters from , 75"" to 1, "", Fits stem diameters from , 75"" to 1"" SKU: RCHG0567