Item # bci2006785

Watts 1-1/2" Hot or Cold Water Anti-Siphon Vacuum Breaker

Model: 0340974

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Product Overview

1-1/2" Hot or Cold Water Anti-Siphon Vacuum Breaker

Series 188A is designed to prevent the back siphonage of contaminated water into the potable water supply. Features a lightweight, durable “disc float” suitable for temperatures up to 180 degrees F 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. Recommended for low flow installations such as laboratory equipment which use small amounts of water. Contains a durable silicone disc which has high heat and water hammer shock resistance and ensures tight seating with the lightest of seating contacts.

Watts 0340974 Features:

  • Vacuum breaker only

Watts 0340974 Specifications:

  • Material: Brass
  • Connection Size: 1-1/2"
  • Weight: 3.4 lbs.

This product is listed under the following manufacturer number(s):

Dimensions and Measurements

Product Weight
3.4 lbs.
Water Connection

Characteristics and Features


Warranty and Product Information

Lead Leaching Certified NSF/ANSI 61
N/A (Regulation does not apply)