Replacement O-Ring for HOB-1.5, WS-1 and HF-M Skimmers

This is a direct replacement for the collection cup O-ring that adjusts the cup upward or downward on the following AquaMaxx Skimmers:

• HOB-1.5 Hang-On-Back Protein Skimmer
• WS-1 In-Sump Protein Skimmer
• AquaMaxx HF-M Multi Filter with Protein Skimmer