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Anti-Siphon Vacuum Breakers for Irrigation Systems

Series 188A Anti-Siphon Vacuum Breakers for Irrigation Systems prevent the reverse flow of polluted water from entering into the potable water supply due to backsiphonage. They have a brass body construction with bronze internal trim, a chemical resistant silicone seat disc, and an atmospheric vent to prevent spilling. Maximum Pressure:125psi (8.6 bar).


  • Chemical-resistant, silicone seat disc with high heat and water hammer shock resistance ensures tight seating
  • Atmospheric vent closes to prevent spilling under all rates of flow
  • Lightweight, durable "disc float" for closing atmospheric vent is suitable for temperatures up to 180° F (82° C)
  • Brass body with bronze internal trim

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Approval Information

For approval information, please refer to the products specification sheet. For any other information on product certification and documentation information, please visit our certification partner websites: