Watts 0881378 Air Gap

The Watts 0881378 Air Gap, professionally known as the 909-AG-F, is an essential component for any contractor managing backflow preventer maintenance. Designed specifically for RPZ assembly discharge, this cast iron air gap provides the required unobstructed physical separation between the relief valve outlet and the receiving drain line. Integrating this unit ensures the system remains compliant with plumbing codes by preventing potential cross-contamination during a back-siphonage or back-pressure event. The Watts 0881378 is engineered for a seamless fit with 1-1/4" to 3" Series 009 and 909 assemblies, as well as 1-1/4" to 2" 009M1 and 2" 009M2 models. Featuring a durable epoxy-coated finish to resist corrosion in damp environments, this cast iron air gap is compatible with both horizontal and vertical piping runs, though a vent elbow is required for vertical setups to ensure proper venting. By effectively managing nuisance discharge from the relief valve, the 909-AG-F air gap protects the surrounding facility from water damage while maintaining the integrity of the potable water supply.

Key Benefits

• Universal Compatibility: Fits 1-1/4" to 3" Watts 009/909 series and specific 009M1/M2 models, streamlining your truck stock.
• Industrial Durability: Constructed from heavy-duty cast iron with an epoxy coating to withstand harsh mechanical room conditions.
• Flexible Installation: Engineered for both horizontal and vertical configurations, allowing for NPT threaded connection versatility.
• Code Compliance: Establishes the necessary physical air gap to meet backflow prevention accessories standards for health hazard containment.
• Flood Protection: Specifically designed to handle nuisance relief valve discharge, directing water safely to the drain.

Common Questions

Can the Watts 0881378 handle the full discharge of an RPZ relief valve?
No, air gaps are designed to manage nuisance discharge and minor fluctuations. If a relief valve fully opens due to a significant check valve failure, the air gap may not capture the entire volume of water. Proper floor drainage is always required.

Is the 909-AG-F compatible with Lead-Free (LF) assemblies?
Yes, the Watts 0881378 is a non-wetted accessory and is the standard air gap kit used for both standard and Lead-Free versions of the 009 and 909 series.

What is the connection size for the drain line?
This model typically features a 2-inch FNPT outlet, allowing for a standard threaded connection to your drain piping system.

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.