Watts - 1" Anti-Siphon Vacuum Breaker

  • 1" connection
  • An anti-siphon vacuum breaker shall be installed where indicated on the plans to prevent the backsiphonage of contaminated water
  • Prevents reverse flow of polluted water
  • Sold Individually. Manufacturer Pack Size = 24
Quantity (minimum 1):

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.

  • Maximum Pressure: 125 PSI (8.6 bar)
Watts Regulator Co
Connection Size
Optimum Pressure
Outer Diameter
Pressure Rating Range
2 - 125 PSI
Tube Size
3/4" - 2"
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