SeaStar Solutions Cap Plug Nut Kit HF5524

The SeaStar Solutions HF5524 Cap Plug Nut Kit is a practical service and maintenance item for marine hydraulic steering systems. This kit includes three brass cap plugs/nuts designed to seal off 3/8 in. compression fitting ends, helping protect open hydraulic connections during installation, repairs, storage, or system modifications.

Made from brass for durability and corrosion resistance, these closing nuts are built for marine use and provide a dependable way to cap unused or temporarily disconnected lines. The fittings use a 9/16 in.-24 extra-fine thread, matching the fitting style used across SeaStar and Teleflex manual hydraulic steering applications.

This pack of three is a convenient option for marine technicians, boat owners, and installers who want spare caps on hand for service work or hydraulic steering line maintenance.

Key Features

• Includes 3 cap plug nuts per kit
• Designed to cap off 3/8 in. compression fitting ends
• Constructed from brass for durability and marine corrosion resistance
• Uses 9/16 in.-24 extra-fine threads
• Suitable for SeaStar Solutions and Teleflex marine hydraulic steering systems
• Ideal for service, repair, winterization, and temporary line closure

Technical Specifications

• Brand: SeaStar Solutions
• Part Number: HF5524
• Product Type: Cap Plug Nut Kit / Closing Nuts
• Pack Size: 3 pieces
• Material: Brass
• Fitting Size: 3/8 in. tube/compression fitting
• Thread Size: 9/16 in.-24 extra fine
• Application: Marine hydraulic steering fitting closure

Compatibility & Fitment
The HF5524 is designed for SeaStar / Teleflex marine hydraulic steering systems that use 3/8 in. compression fittings with 9/16 in.-24 extra-fine threads. It is used to cap off open fitting ends during maintenance or when a hydraulic line or port is not in active use.

Fits/works with:

• SeaStar hydraulic steering systems using 3/8 in. tubing fittings
• Teleflex hydraulic steering applications using the same fitting specification
• Marine service setups requiring temporary or permanent closure of unused hydraulic fitting ends

Fitment notes:

• Confirm your steering system uses 3/8 in. compression fittings before ordering.
• Confirm thread compatibility is 9/16 in.-24 extra fine.
• Best suited for hydraulic steering maintenance and service rather than as a universal plumbing fitting. This is an inference based on the product being consistently described for SeaStar/Teleflex steering systems.

Maintenance Tips

• Inspect brass fittings regularly for wear, thread damage, or corrosion.
• Clean mating threads before installation to help ensure a proper seal.
• Store spare cap plug nuts in a dry parts box to reduce oxidation.
• Replace any plug that shows deformation or sealing damage after repeated service use.

Small part, big peace of mind because a proper seal is the foundation of a dry, reliable boat.

Shipping: Ships same or next day for fast Canada wide shipping.