Octo CR-7000 Calcium Reactor Lid O-ring
SKU: ROP-CR-7-ORING
- 100% Genuine OEM Factory Gasket: Manufactured directly by Reef Octopus as an exact structural fit to drop into the specialized large-scale threaded main lid groove.
- Premium Flexible Silicone Compound: Forged from a highly resilient, saltwater-safe silicone elastomer that resists compression setting and flat-spotting.
- Acid-Resistant Engineering: Built to maintain an uncompromised structural seal under non-stop exposure to highly acidic (6.5 to 6.8 pH) CO2-saturated fluids.
- Commercial-Grade Structural Fitment: Dedicated factory replacement footprint across the heavy-duty CR7000 and CR7000D commercial media cylinder lines.
- Leak-Free Siphon Lockdown: Ensures the primary reaction chamber can safely hold structural backpressure without dripping or losing gaseous carbon dioxide.
Reef Octopus
Globally trusted for premium protein skimmers and pumps, engineered in-house for unmatched reef filtration performance.
Reef Octopus CR7000 Replacement Calcium Reactor Lid O-Ring (SKU: ROP-CR-7-ORING)
The Reef Octopus CR7000 Replacement Calcium Reactor Lid O-Ring (SKU: ROP-CR-7-ORING) is an authentic, structural OEM sealing hardware component distributed by CoralVue to preserve high-pressure gas containment and prevent aggressive salt creep on massive, commercial-scale filtration systems. High-capacity calcium reactors function by constantly recirculating a pool of aquarium water injected with carbon dioxide (CO2) across a massive bed of aragonite coral media. To lower the internal pH enough to dissolve the media, the entire system must maintain a strict airtight siphon. Because these heavy-duty lids are broken down frequently during intensive media updates, the sealing gasket handles constant compression and friction. Over years of operation, standard gaskets will stretch, develop flat spots, or flatten out—leading to sudden pressure drops or trace water leaks inside your cabinet.
Molded from premium, chemical-inert silicone rubber, the ROP-CR-7-ORING forms an airtight, elastic barrier inside the pre-carved track of the heavy Super Reef Octopus (SRO) CR7000 lid arrays. This replacement ring is explicitly calibrated to span both the standard single-tower and dual-tower (D) system layout scales. Replacing a compromised, dried-out, or salt-crusted gasket with this genuine factory piece keeps your internal pH levels perfectly stable, protects against low-pressure gas drop-offs, and shields your electronic equipment from destructive, fine salt spray.
Key Features
Prevents Corrosive Sump Closet Salt Creep: Re-establishes a flawless watertight lock at the highest pressure point of the cylinder, keeping dry filtration areas protected.
Maintains Airtight Internal pH Environments: Prevents gaseous carbon dioxide from bleeding out into the room, stabilizing your media dissolution loop.
Instant Friction-Fit Drop Installation: Form-fitted to slip directly into the integrated under-lid tracking tracks without requiring sticky sealing adhesives.
(Note: This retail box includes (1) individual silicone lid o-ring. Replacement red threaded lids, clear acrylic reactor columns, pH probe holders, and high-volume recirculation pumps are sold under separate product categories).
What’s Included:
(1) Reef Octopus Commercial Silicone Replacement Lid O-Ring
Technical Specs:
Official Manufacturing Title: Reef Octopus SRO Calcium Reactor Lid Oring (CR7000)
SKU / Factory Part Identifier: ROP-CR-7-ORING
Structural Material Foundation: Low-Durometer Marine Saltwater-Grade Flexible Silicone Elastomer
Target Lid Geometry Sizing: Form-Fitted for Oversized CR7000 Red Threaded Main Chamber Lids
Primary System Pathway Track: Reactor Cap Fluid Containment and Gas Vacuum Pressure Seal
Platform Series Compatibility: Reef Octopus CR7000 and CR7000D (First Chamber Primary Cap Only)
WARRANTY
CoralVue, Inc. hereby guarantee this product to be free from defects in material and workmanship for a period of:
- 90days
Warranty is activated on the date of purchase.
This Standard Limited Warranty applies and is limited as follows:
- To the product only as long as it remains in the possession of the original purchaser.
- To the product that has not been subject to accident, misuse, or abuse.
- To the product that has not been modified, altered, defaced, or had repairs made or attempted by other than CoralVue, Inc.
- That CoralVue be immediately notified in writing within ten (10) days of the owner's or his agent's first knowledge of the defect.
- That CoralVue, Inc. shall be given the first opportunity to make any repairs, replacements, or corrections to the defective construction within a reasonable period of time.
- Under no circumstances shall CoralVue and/or the Manufacturer be liable by virtue of this warranty or otherwise for damage to any person or property whatsoever for any special, indirect, secondary, or consequential damages of any nature, however arising out of the use or inability to use because of the product defect.
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- Unplug your reactor's recirculation pump, isolate your feed lines, and close the main valve on your pressurized CO2 gas tank to fully depressurize the system.
- Spin the oversized red threaded lid counter-clockwise to remove it from the top of the primary reactor chamber.
- Flip the lid upside down to locate the old, flattened o-ring resting inside the outer circular groove. Use a plastic tool or toothpick to gently pry the old ring out. Warning: Never use a sharp metal knife or screwdriver to pry the ring, as you can easily gouge the soft plastic groove and create a permanent leak path.
- Use a soft rag dipped in warm vinegar to thoroughly scrub the empty o-ring channel, removing any trapped calcification, loose aragonite dust, or organic slime.
- Take your fresh ROP-CR-7-ORING out of its packaging. Press it firmly into the clean circular channel by hand, ensuring it sits entirely flat without twisting or bunching up.
- Pro Tip: Rub a paper-thin layer of reef-safe silicone grease across the exposed face of the ring. Thread the red lid back onto the reactor tower by hand until tight to restore a flawless, leak-free seal.
Pro Tips:
- Always Check for a Hidden Twist in the Silicone Ring During Seating. Because these oversized commercial silicone gaskets are exceptionally flexible, it is very common for the ring to subtly twist on its axis as you push it into the deep under-lid tracking channel. A twisted o-ring creates a tiny uneven high-point along the sealing face. When you screw the heavy red lid down, that small twist will prevent a flush seal, resulting in a slow micro-leak once the recirculation pump fires up. Run your thumb firmly around the entire perimeter of the installed ring to guarantee it sits perfectly smooth and flat.
- Apply a Thin Layer of Reef-Safe Silicone Grease to Extend Operating Lifespan. Whenever you break down your heavy CR7000 reactor to replenish your aragonite coral media, take a moment to lightly coat this silicone o-ring with a high-purity, reef-safe silicone lubricant. Silicone rubber continuously subjected to low-pH aquarium fluid and friction can slowly dry out and become brittle over time. A micro-layer of lubrication helps the heavy threaded lid glide over the rubber without binding or pinching, significantly extending the life of your seal and making future cleanings much easier to open.
- Never Use Harsh Tool Wrenches to Tighten the Threaded Lid Down. Reef Octopus commercial-scale reactors are designed with high-precision threads on their heavy red lids to form an effortless compression seal against this thick silicone o-ring. You should always screw the lid down entirely by hand. Never use household strap wrenches, pipe tools, or hammers to force the red lid tighter. Over-tightening the cap doesn't improve the seal; instead, it will over-compress the silicone ring into a permanent flat-spot, warp the top flange, or fracture the clear cast-acrylic walls of your expensive reactor.