Install Instructions
Installation, Maintenance, & Repair 
Series 009 and LF009
Reduced Pressure Zone Assemblies
Sizes: 
1
⁄4" – 3" (8 – 80mm)
RP/IS-009
3" (80mm) 009NRS 
Testing
For field testing procedure, refer to Watts installation sheets  
IS-TK-DP/DL, IS-TK-9A, IS-TK-99E and IS-TK-99D found on 
www.watts.com.
For other repair kits and service parts, refer to our Backflow 
Prevention Products Repair Kits & Service Parts price list PL-RP-
BPD found on www.watts.com.
For technical assistance, contact your local Watts representative.
NOTICE
For Australia and New Zealand, line strainers should be installed 
between the upstream shutoff valve and the inlet of the backflow 
preventer.
Local building or plumbing codes may require modifications to 
the information provided. You are required to consult the local 
building and plumbing codes prior to installation. If this informa-
tion is not consistent with local building or plumbing codes, the 
local codes should be followed.
Need for Periodic Inspection/Maintenance: This product must 
be tested periodically in compliance with local codes, but at least 
once per year or more as service conditions warrant.
If installed on a fire suppression system, all mechanical checks, 
such as alarms and backflow preventers, should be flow tested and 
inspected in accordance with NFPA 13 and/or NFPA 25.
Corrosive water conditions, and/or unauthorized adjustments or 
repair could render the product ineffective for the service intended. 
Regular checking and cleaning of the product’s internal components 
helps assure maximum life and proper product function.
WARNING
!
Read this Manual BEFORE using this equipment.
Failure to read and follow all safety and use information 
can result in death, serious personal injury, property 
damage, or damage to the equipment.
Keep this Manual for future reference.
Installation Instructions
Series 009 and LF009
Indoors – 
Figure 1
For indoor installations, it is important that the assembly be easily 
accessible to facilitate testing and servicing. If it is lo cat ed in a line 
close to a wall, be sure the test cocks are easily accessible. A drain 
line and air gap (see literature ES-AG/EL/TC) should be piped from 
the relief valve connection as shown, where evidence of discharge 
will be clearly visible and so that water dam age will not occur. 
Therefore, never install in concealed locations.
Figure 1
Air Gap
Main
Strainer
Meter
2
1
⁄2" – 3" (65-80mm) 009
12"
NOTICE
In an area where freezing conditions can occur, Series 009 and 
LF009 should be installed above ground in an insulated enclosure.
Series 009 and LF009 must be installed in an ac ces si ble location 
to facilitate testing and ser vic ing. A discharge line should be piped 
from the air gap at the relief valve con nec tion making sure that 
there is adequate drainage. Never pipe the discharge line directly 
into a drainage ditch, sewer or sump. Series 009 and LF009 
should never be in stalled where any part of the unit could become 
submerged in standing water. 
Outside – Figure 2
In an area where freezing conditions do not occur, Series 009 and 
LF009 can be installed outside. The most sat is fac to ry in stal la tion is 
above ground and should be in stalled in this manner when ev er pos-
sible.
It is generally recommended that back flow preventers never be 
placed in pits unless absolutely necessary and then only when 
approved by local codes. In such cases, a modified pit installation 
is preferred.
Now available, WattsBox 
Insulated Enclosures, 
for more information, send 
for literature ES-WB.
Figure 2
WattsBox
12"




