Show or Hide

Water Safety & Flow Control



Bronze Air Separators



1, 1 1/4 in. (25, 32mm)


Series AS-B Bronze Air Separators are used in commercial and residential, hydronic heating applications to separate air from water in the piping system. It consists of a bronze body construction with tapings for a boiler-fill expansion tank, a 1/2 in. (15mm) FV4-M1 float vent, and a 1/2 in. (15mm) brass pipe plug. Series AS-B comes standard with 1/2 in. (15mm) float vent. Available in AS-B-S (sweat connection). Series AS-B provides continuous purging and venting of air in the system when installed with Watts Series FV4-M1 float vent. Horizontal mount only. It is ideal for use in radiant heat systems. Maximum Pressure: 125psi (8.6 bar).

Loading Models/UPC Codes...

There are currently no BIM drawings available for this product.

Approval information is not available on this item, please contact your local Watts Representative for this information.
Loading warranty information...

Disclaimer: Watts product dimensions in U.S. customary units and metric are approximate and are provided for reference only. For precise measurements, please contact Watts Technical Service. Watts reserves the right to change or modify product design, construction, specifications, or materials without prior notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold.

Please Note: Watts literature requires Adobe Acrobat Reader to view.

Additional Information

Danger – Scalding Lurks!

Every year, thousands of people suffer serious thermal shock or scalding injuries in their bathtubs, sinks and showers.

Click here for informative resources to help you protect against these dangers.

Learn About

Thermostatic Mixing Valves

Every year thousands suffer injuries as a result of hot water scalding and thermal shock injuries. Thermostatic mixing valves protect against these dangers.

To learn more about thermostatic mixing valves and how they work, click here.