SeaStar HF5592 Single Station Fitting Kit 5/8" Copper Tube

SeaStar HF5592 - Single Station Fitting Kit (5/8" Copper Tube)

The SeaStar HF5592 is a single-station fitting kit for steering systems plumbed with 5/8" O.D. copper tubing. It provides the brass SAE 45° flare connections needed to plumb one helm to your inboard cylinder on heavy-duty two-line systems such as Capilano (and compatible Hynautic installs). Ideal when you’re building or re-plumbing a single-station hydraulic system that specifies 5/8" copper runs for lower expansion and crisp helm response.

At a Glance

• Part No.: HF5592
• Use: Single station / one helm
• Tubing size: 5/8" O.D. copper (Type L seamless soft-annealed recommended)
• Fitting style: Brass, SAE 45° flare
• Systems: Capilano two-line inboard steering (and select Hynautic/other compatible systems)

Compatibility Notes

• Capilano 1275V helms typically use 5/8" O.D. copper runs. If your helm is a 1250V, see the HF5590 kit (1/2" copper). The 1350 helm uses 3/4" copper (no OEM kit provided).
• Use SAE 45° flare connections for copper tube. Apply pipe thread sealant only on NPT threads (never on flare seats).
• Capilano systems use Dexron II ATF as steering fluid (not SeaStar HF).

Related Kits (Helpful Cross-Refs)

Installation Overview - Copper Tube & Flare Connections

Always follow the installation guide for your exact helm/cylinder. This quick overview highlights best practices when plumbing with 5/8" copper tube and SAE 45° flare fittings.

Tools you’ll likely use

• Quality 45° SAE flaring tool for 5/8" copper
• Tubing cutter, deburring tool, measuring tape
• Appropriate open-end wrenches for flare nuts & NPT adapters
• Pipe thread sealant (e.g., Loctite P.S.T.) for NPT threads only

Typical steps

1. Plan runs: Route tube with sweeping bends; avoid tight radii and chafe points.
2. Cut & prep: Cut square, deburr I.D./O.D., slide flare nut on the tube before flaring.
3. Flare at 45°: Make clean, full-seat SAE flares (no cracks). Keep flare faces clean and dry.
4. Seal NPT threads only: Apply thread sealant to male NPT threads if used. Do not use sealant or tape on flare seats.
5. Tighten: Snug flare nuts to a leak-free seal without over-torque. Recheck after first sea trial.
6. Bleed & test: Fill with the correct fluid (Dexron II ATF for Capilano), purge air, and inspect for leaks.

FAQs

• Which helms need 5/8" copper? Capilano 1275V typically specifies 5/8" O.D. copper. The 1250V uses 1/2"; 1350 uses 3/4".
• Is Type L copper required? SeaStar recommends seamless soft-annealed refrigeration copper, Type L for best performance.
• Can I add a second station later? Yes - use HF5593 (5/8") as the additional-station kit to pair with HF5592.

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