The HTFJAZICMT Filter is suitable for: Riptide Swim Spa - Hydros / Neptune / Titan / Poseidon / Atlantis / Nautilus.
Please note, if you are purchasing this filter for the first time after the filter you were given with your swim spa it may be slightly smaller. This filter is the direct equivalent.
Measure: 14.4cm x 18cm.
Top Hole: Handle.
Bottom Hole: 5cm (male course thread).