Technical Specifications

Series N388
Hot or Cold Water Anti-Siphon
Vacuum Breaker
Sizes:
1
⁄4" and
3
⁄8" (8 and10mm)
Bottom Inlet and Outlet Connections
Series N388 represents a new line of vacuum breakers
designed to prevent back-siphonage of contaminated water
into the potable water supply.
They feature a lightweight, durable “disc float” suitable for
temperatures up to 180°F (82°C) which closes the atmos-
pheric vent to prevent spilling under all rates of flow. They
are ideally recommended for low flow installations such as
laboratory equipment which use small amounts of water.
They also contain a durable silicone disc which has high
heat and water hammer shock resistance and assures tight
seating with the lightest of seating contact.
Full Size Orifice - All Series N388 valves have a full-size orifice
to assure pipe size capacity. Water passages are streamline
to provide high water flow with minimal pressure loss.
Features
• Brass body
• Full size orifice for maximum flow
• Lightweight disc assembly prevents spilling under all rates
of flow
• Bronze, satin chrome and polished chrome finish available
Models
N388 Bronze
N388-SC Satin Chrome
N388-C Polished Chrome
Applications
• Bidets
• Bottle Washers
• Chemical Dispenser
• Dishwasher
• Photographic Tanks
• Shampoo Sinks
• Soap Dispensers
For Health Hazard Applications
ES-N388
Job Name
–––––––––––––––––––––––––––––––––––––––––––
Contractor
––––––––––––––––––––––––––––––––––––––––––––
Job Location
–––––––––––––––––––––––––––––––––––––––––
Approval
–––––––––––––––––––––––––––––––––––––––––––––
Engineer
–––––––––––––––––––––––––––––––––––––––––––––
Contractor’s P.O. No.
–––––––––––––––––––––––––––––––––––
Approval
–––––––––––––––––––––––––––––––––––––––––––––
Representative
––––––––––––––––––––––––––––––––––––––––
N388
Model N388
SUPPLY
FIXTURE
Specifications
For Anti-Siphon Vacuum Breakers
An atmospheric type anti-siphon vacuum breaker shall be
installed where indicated on the plans to prevent the back-
siphonage of contaminated water. The device shall include
lightweight disc float with silicone disc for tight seating. This
device is not to be used under continuous pressure or where
there is a possibility that a back pressure condition may
develop. The device shall meet the requirement of ASSE
Standard 1001: CSA B64.1.1. Watts Regulator Company
Series N388.
IMPORTANT NOTE: Vacuum Breakers are not designed, tested or
approved to protect against backpressure backflow. For protection
against backpressure backflow, install Watts No. 909/009 Series
Reduced Pressure Principle Backflow Preventers.
NOT LESS
THAN 6"
Installation
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.