Octo Classic 2000HOB O-Ring
SKU: ROP-CC-OR-2000HOB
- Genuine OEM Direct Replacement: Authentic factory-spec black nitrile rubber collection cup alignment gasket designed specifically for the Reef Octopus Classic 2000HOB (BH-2000) hang-on back protein skimmer.
- Precise Friction-Fit Stabilization: Provides the vital mechanical resistance required to suspend and lock the collection cup at your desired height baseline.
- High-Flex Nitrile Material Compound: Engineered from industrial-grade nitrile rubber that offers exceptional elasticity, tear resistance, and shape memory.
- Preventative External Leak Seal: Acts as a tight physical boundary ring inside the skimmer collar to stop splashing condensation or dynamic foam from weeping down the outer chamber.
- 100% Reef-Safe Construction: Completely inert material matrix will not leach synthetic oils, plasticizers, or chemical agents into saltwater systems.
- Toolless Drop-In Restoration: Instantly slides over the clear acrylic collection cup neck for immediate replacement during routine filter tear-downs.
Reef Octopus
Globally trusted for premium protein skimmers and pumps, engineered in-house for unmatched reef filtration performance.
Reef Octopus Classic 2000HOB Replacement Collection Cup O-Ring (ROP-CC-OR-2000HOB)
The Reef Octopus Classic 2000HOB Collection Cup O-Ring (SKU: ROP-CC-OR-2000HOB) is an authentic factory-spec replacement adjustment gasket distributed by CoralVue to maintain precise foam level calibration across your hang-on back protein skimmer setup. On high-performance external hang-on back skimmers like the Classic 2000HOB, adjusting the dryness or wetness of your organic extraction relies on changing the physical height of the collection cup. This thick, black rubber alignment ring slides tightly onto the cylindrical acrylic neck of the cup, acting as a structural friction buffer inside the skimmer body’s mounting collar block.
Over years of continuous aquatic filtration service, this rubber ring is constantly subjected to saltwater saturation, raw organic waste acids, and structural stretching during weekly cleaning teardowns. Over time, environmental factors cause native rubber gaskets to slowly dry out, rot, flatten, or snap entirely. If this o-ring stretches out or goes missing, the clear acrylic collection cup will immediately lose its friction hold and slide completely down to its lowest resting seat, causing massive over-skimming, heavy wet flooding, and instant wastewater overflows onto your home flooring. Replacing a degraded or cracked ring with this original factory component restores perfect vertical hold, allowing you to lock in your skimming preference with complete security.
Key Features
True Factory Sizing Tolerances: Molded to match the exact inner diameter and cross-section thickness configurations required for the oversized Classic 2000HOB neck matrix.
Aggressive Structural Grip Profile: High-friction rubber composition grips clear polished acrylic surfaces tightly without scratching, preventing unwanted sliding under pump vibration.
Chemical Safety Matrix: Fully engineered to resist long-term contact with intensive ozone gas injection and hyper-concentrated aquarium organic sludges.
(Note: This replacement component consists of the black rubber sealing o-ring gasket only. Clear acrylic collection cups, matching lids, and molded skimmer towers are sold separately).
Verified Hardware Compatibility
Reef Octopus Classic HOB Series: Sized explicitly for the large-body Classic 2000HOB (alternatively labeled as the BH-2000) hang-on back external skimmer loop.
(Note: This adjustment o-ring is manufactured specifically to fit the wide-bore dimensions of the 2000HOB model. Smaller skimmer units, such as the Classic 100HOB or 1000HOB, utilize narrower column paths and require their respective model-specific replacement SKUs).
What’s Included:
(1) Reef Octopus Replacement Classic 2000HOB Rubber Collection Cup Adjustment O-Ring
(Note: Clear acrylic collection cups, cup top covers, nylon lock screws, and Aquatrance pinwheel pumps are sold separately).
Technical Specs:
Official Manufacturing Title: Reef Octopus Classic HOB Collection Cup O-Ring (2000HOB Variant)
SKU / Factory Part Identifier: ROP-CC-OR-2000HOB
Material Matrix Composition: 100% Reef-Safe High-Elasticity Nitrile Rubber (Buna-N)
Profile Shape: Circular Toroid Gasket Profile
Primary Function: Collection Cup Height Positioning & Compression Friction Lock
- Turn off your protein skimmer's pump power supply to stop active water movement before removing any collection hardware.
- Loosen the nylon locking screw on the skimmer body neck collar and slide your collection cup straight up and out of the tower.
- Roll the old, dry-rotted, or over-stretched black rubber o-ring downward off the base of the clear acrylic cup neck and discard it.
- Clean the exterior wall of the collection cup neck with a soft towel to wipe away any built-up organic slime or rough salt creep.
- Take your new ROP-CC-OR-2000HOB o-ring and stretch it carefully over the bottom lip of the cup neck, rolling it upward until it rests in your preferred height position.
- Insert the cup back down into the skimmer body collar, adjust your final skim line depth, gently hand-tighten the nylon screw, and turn your pump back on.
Pro Tips:
- Lubricate the Rubber Face to Prevent Binding and Tearing. When sliding your brand-new rubber o-ring onto the clear acrylic collection cup neck for the first time, the bare rubber can stick aggressively to dry acrylic. Forcing the ring down dry can cause it to twist, pinch, or develop microscopic tears that undermine its holding power. Apply a tiny, micro-thin smear of 100% pure silicone plumbing grease or even a few drops of fresh RO/DI water directly onto the inside track of the ring. This helps it glide smoothly into place without stress.
- Never Use Petroleum Jelly (Vaseline) for Lubrication. If you need to lubricate your collection cup o-ring to make fine-tuning your skimmer performance easier, never use petroleum jelly, mineral oils, or standard household grease products. Petroleum-based products interact aggressively with nitrile and natural rubbers, triggering a rapid chemical breakdown that softens, distorts, and swells the gasket out of shape within weeks. Use only pure, water-insolvent silicone lubricants designed specifically for aquarium filtration gear.
- Maintain an Extra Gasket in Your Dry Maintenance Kit. Because collection cup o-rings must be handled frequently during your weekly wastewater dumping and cup rinsing routines, they are prone to unexpected wear and tear. It is easy to accidentally drop one down a garbage disposal or break an older, salt-hardened ring when stretching it off the neck. Storing a backup o-ring inside your dry storage cabinet ensures you can fix a drop-slipping cup instantly, keeping your water column balanced without filtration downtime.