TruDesign Solenoid-Controlled Vented Loop

Avoid dangerous siphoning with the TruDesign Vented Loop with Solenoid, a premium composite safety valve designed and made in New Zealand. This through-hull siphon-break allows full air admission above the waterline, preventing backflow and accidental flooding in toilet, holding-tank, or engine cooling lines. The integrated solenoid valve (normally open, powered to close) provides instantaneous closure during flushing cycles—eliminating air intrusion common in standard loops 

Constructed from glass-reinforced nylon composite, it offers superior strength, corrosion resistance, and UV durability. The solenoid’s robust polymer cover and diaphragm valve enhance flow capacity and extend service life. Suitable for 12 V or 24 V installations and built to marine standards, it’s ideal for boaters seeking reliable, low-maintenance siphon protection.

Key Features:

• Solenoid-controlled loop valve, seals during flush to prevent air entry 

• Glass-reinforced nylon composite—chemical, UV, and corrosion-resistant 

• Diaphragm valve improves flow performance and reliability 

• Polymer-covered solenoid resists marine exposure 

• Available in 19 mm, 25 mm, or 38 mm sizes with options for 12 V or 24 V

• Made in NZ, with easy screw mounting and consistent ID flow 

Ensure your plumbing system is secure, compliant, and hassle-free with the TruDesign Solenoid Vented Loop.