Dual Check Backflow Preventer with Atmospheric Vent – 20mm Valve for Potable Water Protection

Compact, compliant, and built for backflow protection.

The Watts 9D-AUS 20mm is a dual check backflow preventer designed to safeguard potable water systems from reverse flow in low-hazard applications. It features two independent check valves and an intermediate atmospheric vent that discharges to the atmosphere if a fault occurs — ensuring reliable protection in compact installations.

Ideal for boiler feeds, autoclaves, lab setups, and food service equipment, the 9D-AUS offers plumbers and facility managers a simple, WaterMark-approved solution for maintaining water safety.

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🔧 Key Features:

• Dual Check Protection – Primary rubber-to-rubber and secondary rubber-to-metal check valves

• Atmospheric Vent – Releases water if either check valve fails, protecting the clean supply

• True Line Size – Full 20mm internal diameter for minimal pressure drop

• Versatile Installation – Suitable for vertical or horizontal pipe runs

• Built-In Strainer – Captures debris to prolong performance and reduce maintenance

• Durable Brass Body – Lead-free DZR brass with stainless steel internals

• WaterMark Certified – Fully compliant with Australian standards (WMK25866)

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📐 Specifications:

• Size: 20mm

• Max Working Pressure: 12.1 bar (175 psi)

• Min Operating Pressure: 172 kPa (25 psi)

• Material: Forged brass body, stainless steel parts, rubber check discs

• Connection Type: Compression ends (may vary by supplier)

• Application: Indoor, low-hazard potable water backflow prevention

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💡 Perfect For:
Hot water boilers, food and beverage machinery, dental chairs, autoclaves, sterilizers, and other equipment requiring backflow prevention in 15mm supply lines.

✅ Add to cart now and protect your potable water system with Watts – a global leader in precision plumbing solutions.