Specification

Series 188A
Anti-Siphon Vacuum Breaker
For Irrigation Systems
Sizes:
3
⁄4" - 2"
Series 188As are designed to protect drinking water supplies
from backsiphonage of contaminated water in accordance with
national plumbing codes and water authority requirements for
non-potable service applications such as irrigation, fireline, or
industrial processing. Features a lightweight, durable “disc
float” suitable for temperatures up to 180°F (82°C) 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, allowing water to flow. A
loss of supply pressure or the creation of a negative supply
pressure causes the vent disc assembly to drop, opening the
atmospheric vent and closing the supply side of the valve.
Contains a durable silicone disc which has high heat and
water hammer shock resistance and ensures tight seating
with the lightest of seating contacts.
Specifications
For Anti-Siphon Vacuum Breakers
An anti-siphon vacuum breaker shall be installed where
indicated on the plans to prevent the backsiphonage of
contaminated water. This device is not to be used under
continuous pressure or where there 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.
Materials
Body: Brass
Internal Trim: Bronze
Seat Disc: Silicone
Disc Float: Plastic
ES-188A
188A
1001 B64.1.1
Approvals
Approved by the city of Los Angeles
Pressure – Temperature
Maximum Temperature: 180°F (82°C)
Maximum Working Pressure: 125psi (8.6 bar)
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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.
NOTICE
Inquire with governing authorities for local installation requirements
The information contained herein is not intended to replace the full
product installation and safety information available or the experience
of a trained product installer. You are required to thoroughly read all
installation instructions and product safety information before begin-
ning the installation of this product.
NOTICE