Water Hammer Arresters

Water Hammer Arresters

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Customers who have purchased water hammer arresters have also been:
to pipe hangers and brackets - to pipe cutting tools - to washing machine air gaps
to pipe thawing kits - to excellent selection of faucets - to many sink brands we offer
to angle stop valves - to copper fittings - to drain tools - to squat toilet flushometers
to cast aluminum multi-station fountains - to drill-style drain cleaners - to free standing laundry sinks

Low rates and easiest to calculate/understand shipping/handling for water hammer arresters


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Water hammer is usually recognized by a banging or thumping in water lines. The noise occurs when the flow of moving water is instantaneously stopped by a closing valve. This sudden stop results in a pressure spike behind the valve which acts like a tiny explosion inside the pipe. This pressure spike will reverberate throughout the plumbing system, rattling and shaking pipes, until it is absorbed.

Normally, a sufficient pocket of air will absorb such a pressure spike, but if no pocket of air is present, expensive fixtures and appliances within the plumbing system will be damaged as they are left to absorb this pressure spike.

Arrester Sizing Table
Use this table to determine how many fixture units you have,
choose the arrester with the corresponding fixture unit rating
C.W. means cold water line, H.W. means hot water line

Fixture Type of
Supply Control
Fixture Units
Public Private
Total C.W. H.W. Total C.W. H.W.
Water Closet Flush Valve 10 10 10 6 6 -
Water Closet Flush Tank 5 5 - 3 3 -
Pedestal Urinal Flush Valve 10 10 - - - -
Stall or Wall Urinal Flush Valve 5 5 - - - -
Stall or Wall Urinal Flush Tank 3 3 - - - -
Lavatory Faucet 2 1-1/2 1-1/2 1 1 1
Bathtub Faucet 4 2 3 2 1-1/2 1-1/2
Shower Head Mixing Valve 4 2 3 2 1 2
Bathroom Group Flush Valve Closet - - - 8 8 3
Bathroom Group Flush Tank Closet - - - 6 6 3
Separate Shower Mixing Valve - - - 2 1 2
Service Sink Faucet 3 3 3 - - -
Laundry Tubs (1-3) Faucet - - - 3 3 3
Combination Fixture Faucet - - - 3 3 3

RULE 1: Branch Lines of 20 Feet or Less
The Hydra-Rester should be placed at the end of the branch line between the last two fixtures served as shown (below).

RULE 2: Branch Lines Over 20 Feet
An additional Hydra-Rester (Y) should be placed as shown (below). The additional unit should be placed at the midpoint of the run longer than 20 feet. The sum of the fixture unit ratings of units X and Y combined, should be equal to or greater than the demand of all branches.

The proper layout of a water hammer arrester.

Hydra-Rester
Multi-fixture Water Hammer Arresters
Hydra Rester
Male Pipe Thread Models (MIP):
Item # Conn.
Size
Length Width Fixture Unit
Capacity
Price & Quantity
652-A 1/2" 6-1/2" 1-3/8" 1 - 11 $20.42
653-B 3/4" 8-3/4" 1-3/8" 12 - 32 $25.10
654-C 1" 11" 1-3/8" 33 - 60 $64.00
655-D 1" 10-1/8" 2-1/8" 61 - 113 $77.12
656-E 1" 12-5/8" 2-1/8" 114 - 154 $108.10
657-F 1" 15-1/8" 2-1/8" 155 - 330 $174.70

Hydra Rester
Male "Sweat" (solder) Models:
Item # Conn.
Size
Length Width Fixture Unit
Capacity
Price & Quantity
652-AS 1/2" 8-1/4" 1-3/8" 1 - 11 $19.82
653-BS 3/4" 10" 1-3/8" 12 - 32 $24.51
654-CS 1" 12-1/2" 1-3/8" 33 - 60 $61.69
655-DS 1" 11" 2-1/8" 61 - 113 $74.31
656-ES 1" 13-1/2" 2-1/8" 114 - 154 $105.13
657-FS 1" 16" 2-1/8" 155 - 330 $168.85

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Laundry Mini-Rester #660-H

Mini-Rester
Single fixture Water Hammer Arresters:
Item # Description Price & Quantity
660-H Female swivel hose thread x male hose thread connection $19.77
660-2 1/2" MIP thread connection $16.72
660-C 5/8" O.D. compression connection $16.98
660-T 5/8" O.D. x 5/8" O.D. compression tee (for 1/2" nom CTS) $17.10
660-TC0 1/4" O.D. x 1/4" O.D. compression tee (for ice maker tube) $20.41
660-TC1 3/8" O.D. x 3/8" O.D. compression tee (for riser tube) $20.53
660-TS 5/8" O.D. spigot fitting branch x 1/2" female sweat $19.39
660-S 1/2" male sweat connection $16.69
660-3S 3/4" male sweat connection $16.68
660-TR
(660-TRB)
5/8" compression x reverse nut
The 600-TR and 660-TRB are the same unit
$22.46
660-TR1 3/8" compression x reverse nut $22.85
660-T22 1/2" female sweat x 1/2" female sweat connection (no stop) $18.08
660-V2 1/2" CPVC female solvent weld connection $18.43
660-V82 1/2" CPVC male solvent weld connection $18.04
660-TK Toilet ballcock tee connection - female w.c. x male w.c. $22.74

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Comments/suggestions from one of our water hammer arrestor customers:
I always use male threaded and not solder type, because in hard water areas they will, with time, seize and need to be replaced. Much easier to turn off the water and unscrew a device than do all that soldering. Because they can seize I always avoid putting them inside walls.



PTFE Thread sealing tape:
PTFE thread sealing tape
1/2" x 260" = $0.38

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Common Questions

What is hammer"What is water hammer?"
Water HammerWater hammer occurs a lot! It is frequently recognized by a "thump" or "bang", usually throughout the water line (if you have copper pipes, you'll tend to hear the noise throughout the house). Water hammer can be caused by a number of things. Many times a loose washer that is jumping around in the faucet or valve causes it. This can be fixed by identifying which valve is the culprit and fixing the washer. Other times it is simply caused by water traveling at a rapid rate and suddenly being shut off. The best solution for this is to increase the size of the water supply thereby slowing down the water (a larger pipe being able to deliver the same amount of water in gallons per minute at a slower speed). If this is not possible, then many times a water hammer arrester helps. Sometimes the cause is excessive pressure and the best way to deal with that is to install a pressure regulator as well as an expansion tank (needed by many codes once you install a pressure regulator). In any case, please be aware that sometimes water hammer arresters will not solve your water hammer problem.

What is hammer"What are your most popular hammer arresters?"
Water HammerThe 1/2" through 1" (models 652A, 653B and 654C with standard male threads) for most situations, as well as the 660-H which is specifically for hose threads on appliances such as clothes washing machines.

water hammer arresters"Can these water hammer arrestors be installed inside a wall?"
water hammer arrestersYes. All of the water hammer arrestors shown above are approved for sealed wall installations with no access panel required.

water hammer arresters"Will water hammer arrestors stop all banging inside my wall? Will it solve my noisy pipes problems?"
water hammer arrestersThe water hammer arrestors will not compensate for poor strapping practices. If they are needed and work it is because faucets or valves can be closed too rapidly and create a water hammer. In other words, water hammer arrestors can solve some problems but not all. If you have both bad brakes and bald tires on a car then getting new tires won't solve all of your problems. Same with water hammer arrestors. They can't solve expansion and contraction issues or poor strapping issues but they certainly can usually help somewhat with water hammer issues.

water hammer arresters"I see that you have soldered (male sweat) models of water hammer arresters. They seem like a great idea since I won't have to use copper fittings?"
water hammer arrestersYes, they are a great idea IF you are REAL good at soldering (not overheating). We offer them because we get asked for them. We would like to warn you to not overheat them while soldering as you could then damage the seals. For copper installations, we like to recommend the male threaded type of water arresters (or the compression type if you are using hard copper pipe).

water hammer arresters"At what angle can these water hammer arrestors be installed?"
water hammer arrestersBecause of their secure water chambers, all Hydra-Restors and Mini-Restors can be installed at any angle.

We hope that we have helped you on this page with water hammer arresters (arrestors),
and thank you for helping to make PlumbingSupply.com the most famous Internet plumbing supplier.



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