Replacement Cup Adjustment O-Ring for HOB-1.5, WS-1 and HF-M Protein Skimmers – Aquamaxx

This is a direct replacement for the collection cup O-ring that adjusts the cup upward or downward on the: AquaMaxx HOB-1.5 Protein SkimmerAquaMaxx WS-1 In Sump Protein SkimmerAquaMaxx HF-M Multi Filter