Model 1260XL

Water Hammer Arrester

Application
Ideal for use where Lead-Free* fittings are required. Designed
to protect residential, commercial and industrial water lines
during pressure surges following quick valve closure. This
excessive pressure surge is absorbed by the pre-charged
cushion of air permanently sealed within the water hammer
arrester. The water hammer arrester may be installed within a
stud bay without the need for an access panel.

Standards Compliance
• PDI® Certified WH-201
• ASSE® Listed 1010
• ANSI A112.26.1
• Certified to NSF/ANSI 372* by IAPMO R&T
*(0.25% MAX. WEIGHTED AVERAGE LEAD CONTENT)

Materials
Body Copper Tube (seamless, Type “L”)
Tailpiece Low Lead Brass
Piston Polycarbonate (Sizes A and B), PVC
(Sizes C-F)
O-rings EPDM Pressure
Solder Lead Free Maximum transient pressure surge, with arrester properly
sized and placed in the water supply system, will not rise
above 150 psi following quick valve closure. Maximum static
Features pressure: 200 psi. For best performance, static line pressure
Sizes: A, B , C, D, E, F should not exceed 85 psi; contact the factory for proper sizing
Temperature range -40°F to 212°F if static pressure is greater. Max spike pressure 400 psi.
End connections Threaded ANSI/ASME B1.20.1

Dimensions & Weights (do not include pkg.)

B B
DIMENSIONS
MNPT (approximate) FIXTURE
PDI
MODEL THREAD UNIT
SIZE A B
CAPACITY
in. mm in. mm in. mm
1260XL-A A 1/2 15 6 1/4 159 7/8 22 1 - 11
1260XL-B B 3/4 20 7 5/16 185 7/8 22 12 - 32
1260XL-C C 1 25 9 1/4 235 1 1/8 28.6 33 - 60 A A
1260XL-D D 1 25 9 5/16 237 1 3/4 44 61 - 113
1260XL-E E 1 25 10 1/4 260 2 1/2 64 114 -154
1260XL-F F 1 25 10 7/8 276 2 7/8 73 155 - 330

A, B, C D, E, F

Specifications
The Water Hammer Arrester shall be certified to NSF/ANSI 372, consist of a copper body with a low lead brass hexagonal
male pipe threaded inlet, an acetal, polycarbonate or low lead brass piston, EPDM o-rings and lead free solder. The device
shall be pre-charged and sealed at the factory. The Water Hammer Arrester shall be a ZURN WILKINS Model 1260XL.

Zurn Industries, LLC | Wilkins Rev. K

1747 Commerce Way, Paso Robles, CA U.S.A. 93446 Ph. 855-663-9876, Fax 805-238-5766 Date: 04/19
In Canada | Zurn Industries Limited Document No. WHA-1260XL
3544 Nashua Drive, Mississauga, Ontario L4V 1L2 Ph. 905-405-8272, Fax 905-405-1292 Product No. Model 1260XL

www.zurn.com Page 1 of 2
 Sizing & Placing Data
Table I The fixture unit values shown in Table II represent the
standard ratings used by engineers to size water distribu-
SIZES A B C D E F
tion systems and are also used to size water hammer
FIXTURE arresters. Match total fixture units to correct model of
1 TO 11 12 TO 32 33 TO 60 61 TO 113 114 TO 154 155 TO 330
UNITS water hammer arresters required from Table I. All sizing
data in this brochure are based on flow velocities of 10
Table II F.P.S. or less. The sizing method was designed with a
Fixture Units Sizing Information maximum velocity of 10 F.P.S. to offer assurance that the
TYPES OF FIXTURE-UNITS Water Hammer Arrester is capable of handling shock of
FIXTURE SUPPLY PUBLIC PRIVATE maximum intensity that may be encountered.
CONTROL Total C.W H.W Total C.W H.W
Water Closet Flush Valve 10 10 N/A 6 6 N/A
Water Closet Flush Tank 5 5 N/A 3 3 N/A
Pedestal Urinal Flush Valve 10 10 N/A N/A N/A N/A
EXAMPLE - Fig 1 Fig. 1
Stall or Wall Urinal Flush Valve 5 5 N/A N/A N/A N/A
C.W. =26 Fixture Units "B"
Stall or Wall Urinal Flush Tank 3 3 N/A N/A N/A N/A "A"
Needs -1260XL-B
Lavatory Faucet 2 1 1/2 1 1/2 1 1 1
Bathtub Faucet 4 2 3 2 1 1/2 1 1/2
H.W. =6 Fixture Units
Shower Head Mixing Valve 4 2 3 2 1 2
Needs -1260XL-A
Bathroom Group Flush Valve Closet N/A N/A N/A 8 8 3
Bathroom Group Flush Tank Closet N/A N/A N/A 6 6 3
Separate Shower Mixing Valve N/A N/A N/A 2 1 2
Service Sink Faucet 3 3 3 N/A N/A N/A
Laundry Tubs (1-3) Faucet N/A N/A N/A 3 3 3
Combination Fixture Faucet N/A N/A N/A 3 3 3

Multi-Fixture Branch Lines

Fig. 2
Rule 1 - Branch lines of 20 feet or less. RISER
Water Hammer Arrester should be placed at the end of the WATER HAMMER ARRESTER

branch line between the last two fixtures served, as shown at TYPICAL BRANCH LINE
right. Select required model using fixture unit sizing.

UP TO 20'
Rule 2 - Branch lines exceeding 20 feet. Fig. 3
An additional Water Hammer Arrester should be placed as
shown at right. Select required models using fixture unit siz- OVER 20'

ing. The sum of the fixture unit ratings of units X and Y shall Y X
be equal to or greater than the demand of the branches.

Long Runs Of Piping To Remote Equipment

Table III
FOR FLOW PRESSURES UP 85 PSIG When long runs of piping are employed to serve a remote
Nominal Pipe Diameter item of equipment, the Water Hammer Arrester should be
LENGTH located as close as possible to the point of quick closure
1/2" 3/4" 1" 1 1/4" 1 1/2" 2"
OF PIPE (see Fig. 4).
* ** * ** * ** * ** * ** * **
The size and quantity of Water Hammer Arrester to be
25' A B A B B C C D D E E F installed in branch lines is shown in Table III. Ideally,
50' A B B C C D D E E F F CF the flow pressure in branch lines serving fixtures should
75' B C C D D E AE F F CF EF FF never exceed 55 PSIG. Pressure reducing valves should
100' C D D E E F F CF CF EF FF EFF be installed to maintain proper pressure. When, however,
flow pressures of 65 to 85 PSIG are used, the next larger
125' C D D E E CF AF DF EF FF EFF BFFF size Water Hammer Arrester should be selected (see
150' D E E F F CF DF FF FF DFF FFF FFFF Table III).
* Flow Pressures up to 65 psig
**Flow Pressures over 65 psig and up to 85 psig

WATER HAMMER ARRESTER QUICK CLOSURE VALVE

LONG RUN OF PIPING

SHOCK
Fig. 4 OUTLET

Zurn Industries, LLC | Wilkins

1747 Commerce Way, Paso Robles, CA U.S.A. 93446 Ph. 855-663-9876, Fax 805-238-5766
In Canada | Zurn Industries Limited
3544 Nashua Drive, Mississauga, Ontario L4V 1L2 Ph. 905-405-8272, Fax 905-405-1292
www.zurn.com Page 2 of 2