Watts 0881399 Air Gap

The Watts 0881399 Air Gap (model 909-AG-A) is a heavy-duty, cast iron drainage fitting specifically engineered for Watts Series 909 RPZ backflow preventers within the ¾" to 1" and 1-¼" to 2" size ranges. This genuine OEM component facilitates the physical separation required by plumbing codes between the relief valve discharge port and the drain line. By creating a visible, vertical air gap, it prevents cross-contamination and back-siphonage in the event of a relief valve opening. Designed for high-flow discharge capacities, the 0881399 ensures that fouled water is safely diverted to an open receiving vessel or floor drain without the risk of hydraulic backpressure. Whether servicing a 909 QT or 909 OSY assembly, utilizing this specific RPZ air gap adapter ensures your installation remains compliant with municipal safety standards and protects the integrity of the potable water supply in commercial or industrial mechanical rooms.

Key Benefits

• Unobstructed Drainage: Engineered to handle full relief valve discharge without splashing or overflow.
• Direct Compatibility: Identical to manufacturer part numbers 909AG-A and 909-AG-A for seamless fitment on Series 909 RPZ units.
• Code Compliance: Provides the specified clearance required by health and plumbing authorities for backflow preventer installation.
• Industrial Construction: Cast iron body with protective coating designed for long-term resistance to moisture and corrosion.
• Contamination Prevention: Eliminates direct connections to sewage lines, mitigating the risk of fecal or chemical back-siphonage.

Common Questions

Do I need a specific air gap for the Watts 909 vs. the 009 series?
Yes, the Watts 0881399 Air Gap is specifically designed for the 909 Series. While some air gaps look similar, the mounting bolt patterns and discharge orifice diameters vary between model series; always verify your RPZ backflow preventer model before installation.

Can this air gap adapter be used for both ¾" and 2" 909 units?
The 909-AG-A is the standard air gap assembly for the smaller range of 909 Reduced Pressure Zone valves. For larger diameter assemblies (2-½" and up), a larger air gap model is required to accommodate the increased discharge volume.

Is the mounting hardware included with the 0881399?
This part typically includes the air gap body and the necessary bolts to secure the fitting directly to the bottom of the relief valve housing on Watts 909 assemblies.

Caution: This product may expose you to chemicals known to the State of California to cause cancer or reproductive harm under California Proposition 65.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.