TruDesign Thru-Bulkhead Threaded Tube – Composite BSP Bulkhead Fitting

Create a clean, secure, and corrosion-free pass-through for plumbing or wiring with the TruDesign Thru-Bulkhead Threaded Tube—a high-quality composite fitting designed for marine environments.

Manufactured in New Zealand from glass-reinforced nylon composite, this threaded tube delivers exceptional strength, stiffness, and durability, while remaining lightweight and easy to install. Unlike traditional metal fittings, it eliminates corrosion, electrolysis, and electrical bonding issues, making it ideal for long-term marine use .

Designed to route hoses or electrical wiring through bulkheads or cabinetry, the threaded tube provides a tidy, protected pathway, preventing chafing and wear that can lead to system failure . It integrates seamlessly with TruDesign BSP threaded fittings, allowing you to build a complete and professional plumbing system onboard .

The tube can be cut to length to suit different bulkhead thicknesses and is supplied with nuts and backing washers for secure installation. Built to withstand harsh marine conditions, it offers excellent resistance to fuel, chemicals, UV exposure, and extreme temperatures.

Key Features

• Bulkhead pass-through solution – routes hoses or wiring cleanly
• Glass-reinforced nylon composite – strong, lightweight & durable
• Corrosion and electrolysis free – safer than metal fittings
• Prevents chafing of hoses and wiring – protects systems
• BSP parallel threads – compatible with marine fittings
• Cut-to-length design – suits various bulkhead thicknesses
• Includes nuts & backing washers – ready for installation
• UV and chemical resistant – built for marine environments

Specifications

• Brand: TruDesign
• Product Type: Thru-bulkhead threaded tube
• Material: Glass-reinforced nylon composite
• Thread Type: BSP (parallel thread)
• Length: Approx. 140mm (can be cut to suit)
• Sizes Available: Typically 1″ (25mm) & 1½″ (38mm)
• Temperature Range: Approx. -40°C to +110°C
• Includes: 2 x nuts and backing washers
• Colour: Black

Ideal Applications

• Routing bilge, sanitation, or freshwater hoses through bulkheads
• Passing electrical wiring safely through cabinetry
• Marine plumbing installations requiring tidy, secure routing
• Boat refits and new builds

This fitting is widely used because it provides a professional, long-lasting solution for bulkhead penetrations, reducing wear and improving system reliability.

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 install:

• Pair with TruDesign hose tails or valves for full system integration
• Use marine sealant on threads for a watertight fit
• Ensure correct sizing to match hose diameter for optimal flow