Octo NK300 Neck Extension
SKU: OCT-NK300
• Adds 3.5 inches of vertical height to the skimmer neck
• Substantially increases bubble dwell time for more efficient dissolved organic removal
• Precision-machined high-quality acrylic ensures a seamless, leak-free fit with the skimmer body
• Stackable design allows for aggressive tuning of internal water levels and foam dry-out
• Ideal For: Regal 300; SRO-6000ext; XS300/350; Diablo DCS-300
Reef Octopus
Globally trusted for premium protein skimmers and pumps, engineered in-house for unmatched reef filtration performance.
Reef Octopus NK-300 Neck Extension
The Reef Octopus NK-300 Neck Extension is a high-performance modification designed for large-format protein skimmers, providing a 3.5-inch increase in neck height. This additional vertical space is critical for maximizing "dwell time"—the duration air bubbles remain in contact with dissolved organics—within the reaction chamber. By extending the neck, the NK-300 facilitates a taller, more stable foam column, leading to a higher concentration of waste captured in the collection cup.
Crafted from premium cast acrylic to match the durability of Reef Octopus's flagship lines, the NK-300 offers the structural integrity required for heavy-duty reef filtration. It is the ideal solution for hobbyists managing massive bioloads who want to push their existing Regal, SRO, or Diablo skimmers to peak efficiency. These extensions are stackable, providing the modular flexibility needed to adjust filtration performance based on specific sump depths and nutrient export requirements.
Key Features
• Maximum Height Increase: Adds 3.5 inches to the neck to facilitate an exceptionally stable foam column.
• Superior Dwell Time: Extended bubble contact results in more efficient protein and organic removal.
• Precision Engineering: Designed to maintain a perfect seal with Reef Octopus 300-series and 6000-series bodies.
• High-Grade Construction: Manufactured from heavy-duty acrylic for long-term clarity and strength.
• Adjustable Performance: Stackable design allows for customized height settings and water level control.
Ideal For
• Regal 300 Owners: Fits Regal 300-INT, 300-SSS, and 300-EXT models.
• SRO-6000ext Users: Directly compatible with the SRO-6000 external protein skimmer.
• Extreme and Diablo Series: Fits XS300, XS350, and Diablo DCS-300 (Internal/External) units.
• Large Scale Systems: Hobbyists requiring enhanced filtration for high-volume or heavily stocked aquariums.
What's Included:
• NK-300 3.5-Inch Neck Extension
• Sealing O-ring
Specifications:
• Height: 3.5 inches
• Material: High-quality Cast Acrylic
• Color: Black
• Model Compatibility: Regal 300(int/sss/ext), SRO-6000ext, TDNWB300, XS300 (Extreme/Diablo), XS350 (Extreme/Diablo), Diablo DCS 300(int/ext)
• Warranty: 1-Year Limited Warranty
Warranty
CoralVue, Inc. hereby guarantees this product to be free from defects in material and workmanship for a period of:
- 1 Year
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 first knowledge of defect by owner or his agent.
- That CoralVue, Inc. shall be given 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.
- Turn off the protein skimmer pump and remove the collection cup.
- Ensure the O-ring on the NK-300 extension is clean and properly seated in the groove.
- Align the extension with the skimmer neck and press down firmly to create an airtight seal.
- Reinstall the collection cup on top of the extension.
- Restart the skimmer and monitor the water level; adjustment of the outlet valve may be necessary to compensate for the added height.
Pro Tips:
Confirm your vertical clearance.
At 3.5 inches, this is one of the tallest extensions available. Ensure you have at least 5 inches of clearance above your new total skimmer height to comfortably remove the collection cup for maintenance.
Lubricate O-rings for ease of maintenance. Applying a thin layer of aquarium-safe silicone lubricant to the O-ring will prevent the acrylic from seizing over time and make it much easier to disassemble the unit for deep cleaning.
Fine-tune for "Dry" skimmate. If your skimmer currently produces a light, watery waste, the NK-300 is an excellent way to allow the foam more time to "dry out" as it rises, resulting in a darker, more concentrated skimmate.