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.
Hydra-Rester Multi-fixture Water Hammer Arresters
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
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
$61.84
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
- Or -
Laundry Mini-Rester #660-H
Mini-Rester
Single fixture Water Hammer Arresters:
Toilet ballcock tee connection - female w.c. x male w.c.
$22.74
- Or -
PTFE Thread sealing tape:
1/2" x 260" = $0.38
- Or -
"What is water hammer?" Water 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.
In any case, please be aware that sometimes water hammer arresters will not solve your water hammer problem.
"What are your most popular hammer arresters?" The 1/2" through 1" (models 652A, 653B and 654C with standard male threads) for most situations, as well as the 660-HB which is specifically for hose threads on appliances such as clothes washing machines.
"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?" Yes, 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).
"At what angle can these water hammer arrestors be installed?" Because of their secure water chambers, all Hydra-Restors and Mini-Restors can be installed at any angle.
"Can these water hammer arrestors be installed inside a wall?" Yes. All of the water hammer arrestors shown above are approved for sealed wall installations with no access panel required.
"What is water hammer?"
Water 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.
