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Series 188AAnti-Siphon Vacuum BreakerFor Irrigation Systems

Sizes: 34" - 2" (20 - 50mm)**Series 188As are designed to protect drinking water supplies frombacksiphonage of contaminated water in accordance with nationalplumbing codes and water authority requirements for non-potableservice applications such as irrigation, fireline, or industrial process-ing. Features a lightweight, durable disc float suitable for tem-peratures up to 180F (82C) which closes the atmospheric vent to

prevent spilling under all rates of flow. Upon downstream demand,the vent disc assembly rises, sealing the atmospheric vent, allowingwater to flow. A loss of supply pressure or the creation of a nega-tive supply pressure causes the vent disc assembly to drop, open-ing the atmospheric vent and closing the supply side of the valve.Contains a durable silicone disc which has high heat and waterhammer shock resistance and ensures tight seating with the light-est of seating contacts.

Specifications

For Anti-Siphon Vacuum BreakersAn anti-siphon vacuum breaker shall be installed where indicatedon the plans to prevent the backsiphonage of contaminated water.

This device is not to be used under continuous pressure or wherethere is a possibility that a backpressure condition may develop.

The device shall meet the requirements of A.S.S.E. Standard 1001,

ANSI A112.1.1 and C.S.A. B64. Watts Series 188A.

MaterialsBody: Brass

Internal Trim: Bronze

Seat Disc: Silicone

Disc Float: Plastic

For Health Hazard Applications

ES-188A

Job Name Contractor

Job Location Approval

Engineer Contractors P.O. No.

Approval Representative

188A

1001 B64.1.1

Approvals

Approved by the city of Los Angeles

Pressure TemperatureMaximum Temperature: 180F (82C)

Maximum Working Pressure: 125psi (8.6 bar)

** Metric Dimensions are nominal pipe diameter. This productis produced with NPT threaded end connections.

Watts product specifications 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 with-

out prior notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold.

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