Instruction Manual
S-X65B-FAQ
Frequently Asked Questions
X65B
When I order an X65B 
Water Pressure Reducing 
Valve (WPRV), what 
comes with it?
The X65B is marketed in three different 
ways.    You  may  purchase the  X65B  as 
a  complete  pressure  reducing  valve,  or 
as a Rough-in-Kit, or you may purchase 
the  Cartridge  Assembly  separately  and 
install it  at  the  finish  plumbing stage  to 
complete  the  pressure  reducing valve 
installation.
How does the X65B 
Cartridge Assembly 
work?
The  X65B  factory  preset  Cartridge 
Assembly  is  a  complete  module  that  is 
installed,  typically  during  nal  plumbing 
work,  or  it  can  be  installed  as  a  com-
plete replacement if any required service 
needed—no tools are required.
Can the Cartridge 
Assembly be removed?
The Cartridge Assembly can be easily 
removed, if required, by turning the unit 
counterclockwise—no tools are required. 
Note  that  water  supply  needs  to  be 
turned off  prior  to  any  performance  of 
maintenance.
Should the Cartridge 
Assembly be disassem-
bled?
No,  the  Cartridge Assembly  is  a  factory 
assembled complete unit and is not ser-
viceable. This design allows for quick and 
easy replacement.
What sizes are available 
for the X65B WPRV?
The X65B is offered in full range of sizes 
½"  through  2"  (15  –  50mm)  with  body 
pressure rating of 400psi.
USA: 815 Chestnut St., No. Andover, MA 01845-6098; www.watts.com
Canada: 5435 North Service Rd., Burlington, ONT. L7L 5H7; www.wattscanada.ca
Water Safety & Flow Control Products
What is the set pressure 
for the X65B WPRV from 
the factory?
The  X65B  is  offered  in  two 
pressure settings. The standard 
pressure setting  from the  fac-
tory is 50psi with a spring range 
of  20-80psi.  The  high  pressure 
“HP” version is set at 100psi and 
has a range of 50-150psi.
What standards does the 
X65B WPRV comply with?
The  X65B  standard  range  valve  is  certi-
ed  to  ASSE  1003  and  listed  by  ASSE 
and IAPMO.
What is the maximum 
working pressure of the 
X65B WPRV?
Maximum working pressure of the X65B 
is 400psi.
When 
I order 
a X65B 
Rough-In-
Kit, what 
comes with 
it?
The Rough-In-
Kit consists of 
the valve 
bronze 
body and 
the plastic 
strainer/ 
cap.
When is the 
Rough-In Kit 
used?
The Rough-In Kit can 
be used in the initial 
construction stage. The kit 
body is installed permanently into the 
water system eliminating material and 
labor costs for jumper kits. The unique 
strainer/cap assembly is used until the 
finish plumbing stage. At that point, it 
is replaced with a permanent Cartridge 
Assembly.
What kind of end con-
nections (tailpieces) are 
available on the X65B 
WPRV?
The  X65B  can  be  supplied  with  the  fol-
lowing  end  connections:  either  single 
union or double union,  threaded, solder, 
Quick-Connect, PEX and CPVC.
May I order end  
connections (tailpieces) 
separately for the X65B 
WPRV?
Yes, end connections are available sepa-
rately  in  a  polypropylene  bag  consisting 
of a union nut, end connection (tailpiece) 
and O-ring. The TPK  (tailpiece) kit will 
allow  for  exibility  and  lessen  inventory 
requirement. 
S-X65B-FAQ   0844
  © Watts, 2008 
X65B Rough-in-Kit

