Technical Specifications

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, 8BC
3
⁄4 HT 20 1
1
⁄2 38 1
3
⁄8 35 4.0 113.4
8A, 8AC
3
⁄4 HT 20 1
1
⁄2 38 1
1
⁄2 38 4.0 113.4
NF8, NF8C
3
⁄4 HT 20 2 51 1
1
⁄2 38 5.3 151.2
8P
3
⁄4 HT 20 1
3
⁄4 38 1
3
⁄8 35 1.5 42.5
8FR
3
⁄4 HT 20 1
3
⁄4 38 1
3
⁄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