TruDesign Domed Skin Fitting – Composite Thru Hull (BSP)

Install a safe, reliable, and corrosion-free thru-hull fitting with the TruDesign Domed Skin Fitting—a premium composite solution designed for long-term marine performance.

Manufactured in New Zealand, this fitting is constructed from glass-reinforced nylon composite, providing exceptional strength, stiffness, and impact resistance while remaining lightweight. Unlike traditional bronze fittings, TruDesign skin fittings are completely resistant to corrosion and electrolysis, eliminating common long-term failure risks in saltwater environments .

The smooth domed head design helps reduce drag and minimises the risk of snagging debris, making it ideal for both above and below waterline applications. Certified to ISO 9093 standards and approved by Bureau Veritas, it meets strict marine safety requirements for thru-hull fittings .

Compatible with a wide range of hull types—including GRP, aluminium, steel, and timber boats—this fitting integrates seamlessly into modern marine plumbing systems. For below-waterline installations, it is recommended to pair with a TruDesign ball valve to create a compliant and safe seacock system .

Key Features

• Glass-reinforced nylon composite – strong, lightweight & impact resistant
• Corrosion and electrolysis free – safer than metal fittings
• ISO 9093 certified – meets marine safety standards
• Smooth domed head – reduces drag and fouling
• Suitable above & below waterline – versatile installation
• UV and chemical resistant – long service life
• Paintable surface – compatible with antifouling coatings

Specifications

• Brand: TruDesign
• Product Type: Thru-hull / skin fitting (domed)
• Material: Glass-reinforced nylon composite
• Thread Type: BSP
• Sizes Available: ½″ to 2″ (varies by model)
• Temperature Range: Approx. -40°C to +110°C
• Certification: ISO 9093, IMCI, Bureau Veritas
• Use: Above and below waterline

Ideal Applications

• Bilge pump outlets and intakes
• Engine cooling water systems
• Live bait tank plumbing
• Freshwater and sanitation systems

Composite skin fittings like this are widely used because they offer long service life, reduced maintenance, and improved safety compared to traditional metal fittings.

Why Buy from Barton Marine NZ?

• Trusted NZ supplier of marine plumbing systems
• Fast nationwide delivery
• Genuine TruDesign NZ-made fittings
• Ideal for NZ boating conditions

Pro Tip 

For a complete thru-hull setup:

• Pair with a TruDesign ball valve + hose tail
• Use marine sealant (Sikaflex) for watertight installation
• Add a load-bearing collar for high-load or larger fittings