TruDesign Vented Loop with Solenoid – Composite Anti-Siphon Valve 12V

Protect your vessel from dangerous backflow while maintaining optimal system performance with the TruDesign Vented Loop with Solenoid—a premium composite anti-siphon valve system designed for modern marine plumbing.

This advanced vented loop combines a traditional siphon-break function with an integrated solenoid valve, allowing the system to remain open to air when idle but fully close during operation (e.g. toilet flush cycles). This prevents unwanted air entering the system while still eliminating the risk of siphoning and flooding.

Unlike standard vented loops, the solenoid-controlled design (normally open, powered to close) ensures smooth, uninterrupted flow when needed—making it ideal for electric toilet systems, holding tanks, and engine cooling lines.

Manufactured in New Zealand from glass-reinforced nylon composite, this unit delivers exceptional strength, durability, and resistance to corrosion, UV, and chemicals, ensuring long service life in harsh marine environments.

The integrated diaphragm valve design improves flow performance and ensures rapid siphon breaking, while the constant internal diameter maintains full flow capacity without restriction.

With simple three-point mounting and pre-wired electrical connections, installation is quick and reliable—making it a preferred choice for both marine professionals and DIY boat owners.

Key Features

• Solenoid-controlled vented loop – prevents siphoning and controls airflow
• Normally open valve – closes only when powered (efficient operation)
• Prevents flooding risk – critical safety component
• Maintains full flow during operation – no air disruption during flush cycles
• Glass-reinforced nylon composite – strong, lightweight & durable
• Corrosion & electrolysis free – ideal for marine environments
• Diaphragm valve system – improved performance and reliability
• UV & chemical resistant – handles harsh conditions
• Easy installation – 3-screw mounting with pre-wired leads

Specifications

• Brand: TruDesign
• Product Type: Vented loop with solenoid (anti-siphon valve)
• Voltage Options: 12V (common) / 24V available
• Operation: Normally open (closes when powered)
• Material: Glass-reinforced nylon composite
• Sizes Available:
  • 19mm (¾″)
  • 25mm (1″)
  • 38mm (1½″)
• Temperature Range: -40°C to +110°C
• Mounting: 3-point screw mount
• Wiring: Pre-installed leads for easy connection

Ideal Applications

• Marine toilet inlet systems (electric toilets)
• Holding tank plumbing systems
• Engine and generator cooling lines
• Any above-waterline anti-siphon installation

This product is essential where you need both siphon protection AND controlled airflow, especially in modern marine sanitation systems.

Why Buy from Barton Marine NZ?

• Trusted NZ marine plumbing specialist
• Fast nationwide delivery
• Genuine TruDesign NZ-made components
• Ideal for NZ boating conditions and compliance

Pro Tip 

For best performance:

• Install above the waterline at the highest point in the system
• Wire the solenoid to activate during toilet flush cycles
• Regularly inspect or service the valve for long-term reliability