TruDesign Domed Skin Fitting Long Thread – Composite Thru Hull (BSP)

Install a reliable, corrosion-free thru-hull solution with the TruDesign Domed Skin Fitting Long Thread—a premium composite fitting designed for strength, durability, and long service life in marine environments.

Manufactured in New Zealand, this skin fitting is made from glass-reinforced nylon composite, delivering exceptional strength, stiffness, and impact resistance while remaining lightweight. Unlike traditional metal fittings, TruDesign fittings eliminate corrosion, electrolysis, and bonding issues, making them ideal for long-term use in saltwater conditions.

The long thread design allows installation through thicker hulls, including GRP, aluminium, steel, and timber boats, ensuring a secure fit with sufficient thread engagement for backing nuts and valves.

Its smooth domed head reduces drag and helps prevent snagging, while the high-quality finish is UV resistant and paintable, allowing seamless integration with antifouling coatings.

Certified to ISO 9093:2021 standards and approved by Bureau Veritas, this fitting meets strict marine safety requirements, making it suitable for above and below waterline installations.

Pair with a TruDesign Ball Valve for below water safety compliance. 

Also, to increase the stability and load on the skin fitting, use the TruDesign Load Bearing Collar to spread loads.

Key Features

• Long thread design – ideal for thicker hull installations
• Glass-reinforced nylon composite – strong, lightweight & impact resistant
• Corrosion and electrolysis free – no bonding issues like metal fittings
• ISO 9093 certified – meets marine safety standards
• UV and chemical resistant – withstands harsh marine environments
• Paintable surface – compatible with antifouling coatings
• Smooth domed head – reduces drag and snagging

Specifications

• Brand: TruDesign
• Product Type: Thru-hull / skin fitting (domed long thread)
• Material: Glass-reinforced nylon composite
• Thread Type: BSP
• Sizes Available: Typically ¾" to 2" (19mm–50mm)
• Temperature Range: Approx. -40°C to +110°C
• Certification: ISO 9093:2021, IMCI, Bureau Veritas
• Installation: Above or below waterline

Ideal Applications

• Thru-hull fittings for thicker hulls
• Bilge pump outlets and intakes
• Live bait tank plumbing
• Marine plumbing systems (freshwater, saltwater, waste)

Composite skin fittings like TruDesign are widely used due to their long lifespan, corrosion resistance, and safety compliance, making them a preferred upgrade over traditional bronze or plastic fittings.

Why Buy from Barton Marine NZ?

• Trusted NZ marine hardware supplier
• Fast nationwide delivery
• Genuine TruDesign composite fittings
• Ideal for NZ boating conditions