SEAKEEPER 11667-1SP Lower Cylinder SK9

( Brand: Seakeeper ), ( Part Type: Cylinder ), ( Manufacturer Part Number: 11667-1SP )

Review SEAKEEPER #11667-1sp Sk9 Lower Cylinder Assembly

The Seakeeper 11667-1SP SK9 Lower Cylinder is a crucial component of the Seakeeper gyrostabilizer system, designed to provide exceptional stability and comfort on the water. This lower cylinder is specifically engineered for Seakeeper models using the SK9 stabilizer, ensuring optimal performance.

Measuring 22.4 inches in height and 14.6 inches in diameter, this lower cylinder is both robust and compact. It is manufactured from high-strength, corrosion-resistant materials, including a 316L stainless steel outer casing and an aerospace-grade aluminum inner cylinder. This construction not only ensures durability but also protects the cylinder from the harsh marine environment.

The lower cylinder houses the all-important flywheel assembly, which generates the gyroscopic force that counteracts the boat's roll motion. This flywheel is driven by an electric motor located in the upper cylinder, and it spins at an impressive 3,400 RPM. The flywheel's massive 1,050-pound (476 kg) weight provides substantial stabilization, making the boat more responsive and easier to handle in rough seas.

The Seakeeper 11667-1SP SK9 Lower Cylinder is designed to be self-contained and easy to install. It comes pre-filled with a non-toxic, biodegradable fluid that ensures efficient cooling and lubrication of the system. The cylinder's seals are made from a high-performance, FDA-approved elastomer material, ensuring a leak-free operation.

This lower cylinder is also designed for easy servicing. It features a removable top cover that provides easy access to the internal components. Additionally, the cylinder is equipped with a drain plug, which makes it simple to drain any excess fluid during maintenance.

In summary, the Seakeeper 11667-1SP SK9 Lower Cylinder is a robust and reliable component of the Seakeeper gyrostabilizer system. Its high-strength construction, efficient cooling system, and easy-to-maintain design make it an essential upgrade for any boat seeking improved stability and comfort on the water.

Buying a Seakeeper 11667-1SP SK9 lower cylinder for your marine stabilization system can offer several advantages, but it also comes with some potential drawbacks. Here's a brief analysis of each:

1. Improved Stability: The Seakeeper lower cylinder is a crucial component of the Seakeeper gyrostabilizer system. This system reduces boat roll and pitch, making your vessel more stable and comfortable, especially in rough seas.

2. Enhanced Safety: By reducing boat roll, the Seakeeper system can help prevent injuries and accidents caused by falling or tripping. It can also make it easier to navigate in challenging conditions.

3. Increased Comfort: A more stable boat means a more comfortable ride for passengers, which can be especially important for extended trips or for those prone to seasickness.

4. Increased Resale Value: A Seakeeper-equipped boat can command a higher resale value due to its added comfort and safety features.

1. Cost: The Seakeeper 11667-1SP SK9 lower cylinder is a significant investment, with prices ranging from $30,000 to $50,000 or more, depending on the size and configuration of your boat.

2. Installation Complexity: Installing a Seakeeper system requires specialized knowledge and equipment. It can be a complex process that may require the assistance of a professional installer.

3. Maintenance: While the Seakeeper system requires less maintenance than traditional stabilizers, it still needs regular servicing to ensure optimal performance. This can include periodic inspections, oil changes, and calibration adjustments.

4. Power Consumption: The Seakeeper system requires a significant amount of power to operate, which can be a consideration for boats without large power reserves.

The decision to buy a Seakeeper 11667-1SP SK9 lower cylinder depends on your specific needs, budget, and boating habits. If you frequently encounter rough seas, have a larger boat, or simply want to enhance the comfort and safety of your vessel, the investment may be worthwhile. However, if cost is a concern or you have a smaller boat with limited power reserves, it may be worth considering alternative stabilization solutions. Ultimately, it's important to weigh the advantages and disadvantages carefully before making a decision.

If you believe the benefits of a Seakeeper system outweigh the costs and complexities, I would recommend researching reputable dealers or installers and obtaining quotes for the cost of the lower cylinder and installation. It's also a good idea to consider the ongoing maintenance and power consumption costs. Finally, be sure to inquire about any available financing options or trade-in programs that may help make the investment more manageable.

part # 116671sp price

• $2125.00

specifications vesselvent:

• brand: Seakeeper
• part type: Cylinder
• manufacturer part number: 11667-1SP

general vesselvent:

• Parts Accessories > Boat Parts > Plumbing Ventilation
• condition: New other see details

payments vesselvent:

• wallet: Paypal
• other
• credit card: Diners-club

returns vesselvent:

• policy: Returns Accepted
• paid by: Seller
• time: 30 Days

offer vesselvent:

• options: Ship-to-home
• quantity: 1
• best offers: True
• started: May 6, 2026
• availability: In Stock
• sold: 0

seller vesselvent:

• rating: 99.4%
• # reviews: 8821

shipping vesselvent:

• carrier: USPS
• service: USPS Priority Mail
• transit: 12-20 Days
• class: Expedited
• cost: $83.00
• type: Calculated

Seakeeper 11667-1SP Is Similar To:

• Seakeeper 11666-1sp #11666-1sp K9 Round Upper Cylinder Assembly 50-303 (81.3% similar) $2125.00. (May 6th, 2026)