1. Regulators SCUBA Snorkeling For Sale
  2. sku: 4410665311144632
  3. POSEIDON 53781

POSEIDON 53781 Scuba Cyclon 300

53781 Poseidon Scuba Vintage Cyclon Super 300 - Nib Serial #53781

( Brand: Poseidon ), ( Manufacturer Part Number: 53781 )

Review POSEIDON Scuba Vintage Cyclon Super 300 Nib Serial #53781

Introducing the Poseidon Scuba Cyclon 300, a high-performance regulator designed for serious scuba divers who demand reliability, durability, and exceptional breathing performance. This regulator, model number 53781, is part of Poseidon's renowned Cyclon series, known for their innovative design and advanced technology.

The Poseidon Scuba Cyclon 300 is characterized by its first-stage diaphragm design, which offers superior cold-water performance, ensuring consistent air delivery even in the most challenging diving conditions. The diaphragm design also makes the regulator more compact and lighter in weight, making it an ideal choice for travel and exploration.

The second stage of the Poseidon Scuba Cyclon 300 is engineered for optimal user comfort and ease of use. It features a large, easy-to-grip purge button, which allows divers to clear the regulator quickly and efficiently. The second stage also incorporates an adjustable inhalation effort knob, enabling divers to customize their breathing experience according to their preferences and diving conditions.

The Poseidon Scuba Cyclon 300's braided hose is another notable feature, offering superior flexibility and resistance to abrasion, ensuring the hose lasts longer and performs reliably in demanding environments. Additionally, the hose is equipped with an innovative quick-disconnect mechanism, making it easy to detach the hose from the regulator for convenient storage and transportation.

The Poseidon Scuba Cyclon 300 also boasts a number of other advanced features, including a high-flow exhaust valve that minimizes bubble production, a venturi-initiated Vacuum Assist System (VAS) that improves free flow at the surface, and a Dive/Pre-dive switch that allows divers to switch between surface and submerged breathing without having to purge the regulator.

Overall, the Poseidon Scuba Cyclon 300 is a high-performance regulator that offers superior breathing performance, durability, and ease of use. It is an essential piece of equipment for serious scuba divers who demand the very best in diving technology and performance.

The Poseidon 53781 Scuba Cylon 300 is a steel scuba cylinder with a capacity of 300 cubic feet (8.5 cubic meters) at 3000 psi (207 bar). Here are some pros and cons that may help you decide whether this cylinder is suitable for your scuba diving needs.

Pros:

1. High Capacity: With a capacity of 300 cubic feet, this cylinder can provide a longer dive time, making it an excellent choice for deep or long dives.

2. Durable: Steel cylinders are known for their durability and strength, making them a popular choice among scuba divers.

3. Wide Neck: The cylinder's wide neck allows for easy attachment of various regulators and accessories, increasing flexibility and convenience.

4. Lightweight: Despite its large capacity, the Poseidon 53781 Scuba Cylon 300 is relatively lightweight, making it easier to transport and carry.

5. Compatible with Various Valves: This cylinder is compatible with both DIN and yoke valves, allowing for greater versatility and convenience.

Cons:

1. Heavy when Full: While the cylinder is relatively lightweight when empty, it becomes quite heavy when filled with compressed air, making it more challenging to transport and maneuver.

2. Expensive: Compared to aluminum cylinders, steel cylinders tend to be more expensive due to their higher production costs.

3. Requires More Maintenance: Steel cylinders require more frequent hydrostatic testing and inspection to ensure their safety, which can add to the cost and time involved in owning and maintaining the cylinder.

Conclusion:

The Poseidon 53781 Scuba Cylon 300 is an excellent choice for scuba divers who require a high-capacity cylinder for deep or long dives. Its durability, wide neck, and compatibility with various valves are additional advantages that make this cylinder a popular choice among divers. However, its high cost, weight, and maintenance requirements are important factors to consider before making a purchase.

Recommendation:

If you frequently engage in deep or long dives and prioritize the cylinder's capacity and durability over its weight and cost, then the Poseidon 53781 Scuba Cylon 300 may be an excellent investment for you. However, if you're looking for a more affordable, lightweight, and easy-to-maintain option, you may want to consider an aluminum cylinder instead. Ultimately, the choice depends on your specific diving needs and preferences.

Details:

As with all scuba equipment it should be checked by a qualified person prior to use. Don't wait for the price to drop, not likely happen. Please review all photos and ask any questions prior to buying. You are buying a vintage - New Old Stock Poseidon Cyclon Super 300 one of the oldest model's.

It is rare to find a 50-60 year old regulator that still new in the box. Vintage divers pay close attention to this one, you re not likely find another. Has some corrosion on the one side of first stage. Comes with all you see in photos, no manual, sleeve has been taped because the original glue failed.

specifications regulatoscub:

  • brand: Poseidon
  • mpn: 53781

offer regulatoscub:

  • options: Ship-to-home
  • availability: In Stock
  • started: November 6, 2025
  • sold: 0
  • quantity: 1

general regulatoscub:

  • condition: New other see details
  • Water Sports > Scuba Snorkeling > Regulators

seller regulatoscub:

  • # reviews: 1635
  • rating: 100.0%
  • city: Myrtle Beach, South Carolina

shipping regulatoscub:

  • service: USPS Priority Mail Medium Flat Rate Box
  • cost: $0.00
  • class: Expedited
  • type: Calculated
  • carrier: USPS
  • transit: 2-7 Days

payments regulatoscub:

  • credit card: Discover
  • wallet: Google-pay
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returns regulatoscub:

  • policy: No Returns
category: sporting goods > water sports > scuba snorkeling > regulators, sku: 4410665311144632,
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