Watts NF8 User Manual
For Health Hazard Applications
ES-8
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Series 8
Hose Connection Vacuum
Breakers
Size: 3⁄4" (20mm) hose thread
Series 8 is a line of unique vacuum breakers specially made to
permit the attachment of portable hoses to hose thread
faucets. Designed to prevent the flow of contaminated water
back into the potable water supply, these devices require no
plumbing changes, and screw directly onto a sill cock.
Series 8 can be used on a wide variety of installations, such as
service sinks, swimming pools, photo developing tanks, laundry tubs, wash racks, dairy barns, marinas and general outside
gardening uses.
Features
• Brass body (all models except 8P)
• Stainless steel working parts for longevity
• Durable rubber diaphragm and disc for
consistent positive seating
Models
8A - Furnished with exclusive “Non-Removable” feature and
standardly equipped to allow sill cock to be drained.
Note: Device should only be installed on approved sill cocks
containing at least four full threads. Non-removable
once installed.
8 - Similar to the 8A except it is furnished without the
“Non-Removable” or draining feature. Secured with Allen
head set screw.
8B - Furnished with break-away set screw to provide a
tamper-resistant installation. Standardly equipped to allow
sill cock to be drained.
NF8 - Especially made for wall and yard hydrants. Permits
manual draining for freezing conditions.
8P - Furnished with exclusive patented “Non-Removable”
feature. Standardly equipped to allow sill cock to be drained.
Constructed of durable, corrosion-resistant, reinforced
thermoplastic. Tamper-proof feature.
8AC, 8C, 8BC or NF8C - Same as above but furnished
with chrome finish.
8FR - With freeze relief feature. Protects the 8FR from freeze
damage.
IMPORTANT NOTE:
Series 8 is tested and certified under ANSI A112.1.3
(ASSE 1011), which precludes use under continuous pressure.
This valve should only be used in areas where spillage of
water will not cause damage.
Inlet Connection:
3
⁄4" (20mm) standard female hose thread
Outlet Connection:
3
⁄4" (20mm) standard male hose thread
Maximum Pressure: 125psi (8.6 bar)
Maximum Temperature: 180°F (82°C)
For backflow preventers for tub and shower hand spray sets,
request literature ES-S8.
Specifications
A hose connection type 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. This device shall
meet the requirements of ANSI A112.1.3, ASSE Standard
1011. Vacuum breaker shall be a Watts Series 8.
8P
Tamper-Proof Feature
NF8
Permits Manual Drain
8A
Non-Removable Model
8
8FR
8B
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 without prior notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold.
Approvals
Series 8, 8A, 8B, 8P, 8FR and NF8 are listed by IAPMO.
IMPORTANT: Inquire with governing authorities
for local installation requirements.
Capacity
Performance* Curve
Flow
012345678 910gpm
0 3.8 7.6 11.4 15.1 18.9 23 27 30 34 38 lpm
*Performance as established by an independent testing laboratory.
Dimensions – Weights
Installations
Hose Bibb
Vacuum
Breaker
For Inside or Outside Use
Installation - Inside Service Sink
Drainage Features to Prevent Freezing
Models 8A, 8B, 8FR and 8P hose connection vacuum
breakers are constructed to allow sill cocks to be drained.
Simply remove hose coupling and lightly pull knurled tip of
stem at outlet of valve to allow drainage of collected water.
Note: Do not use Models 8, 8A, 8B, 8P, 8FR
Hose Bibb Vacuum Breakers on frost-free hydrants.
Specify Model NF8.
Do not use where discharge
of water is objectionable.
Hose Bibb
Vacuum Breaker
kPa psi
276 40
241 35
207 30
172 25
138 20
103 15
69 10
35 5
Supply Pressure
A
B
MODEL SIZE (DN) DIMENSIONS WEIGHT
AB
In. mm In. mm In. mm oz. gm.
8, 8C, 8B, 8BC3⁄4 HT 20 11⁄2 38 13⁄8 35 4.0 113.4
8A, 8AC
3
⁄4 HT 20 11⁄2 38 11⁄2 38 4.0 113.4
NF8, NF8C
3
⁄4 HT 20 2 51 11⁄2 38 5.3 151.2
8P
3
⁄4 HT 20 13⁄4 38 13⁄8 35 1.5 42.5
8FR
3
⁄4 HT 20 13⁄4 38 13⁄4 38 7.0 200.0
What is Backsiphonage?
A reversal of normal flow in the system
caused by a negative pressure (vacuum
or partial vacuum) in the supply piping.
1011 B64.2
ES-8 1110 © 2011 Watts
USA: 815 Chestnut St., No. Andover, MA 01845-6098; www.watts.com
Canada: 5435 North Service Rd., Burlington, ONT. L7L 5H7; www.wattscanada.ca
A Watts Water Technologies Company
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