This item is suitable for the Juwel 204, 201K, 301K and the 402 powerheads. This does not fit any of the NEW Juwel Pump 400, 600, 1000 or 1500 range.
The constant vibrations emanating from the pump subject the rubber socket to wear and tear. You may find that it hardens over time. Every litre of filtered water has to pass through this socket! Check it regularly and replace it, when you see the need.