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America's Best Sprinkler

THE PRN/LittleValve Combo

Combining Toro's® Precision Rotating Nozzle
Valvette Systems' Patented In-Stem Flow Regulation (IFR)

=   The Best Sprinkler Ever Made - Rotary Or Spray


No other Sprinkler can Compare with the Benefits  

of In-stem Flow Regulation

Especially when Paired with the PRN nozzle

Distance Range: 20 - 28 feet down to 18 inches

Arc range: 45° - 270°

The flexibility, efficiency and water savings of Toro's PRN when joined with Little Tuffys and  LittleValve sprinkler parts is best described in the videos plus the pictures you'll see in the following 10 sub-pages 

LittleValves make every nozzle and every sprinkler on the market work better but allow Toro's Precision Rotating Nozzle (PRN) to do things that no other nozzle can do.  In fact, PRNs with LittleValve parts can replace every nozzle in your landscape except 
for side, corner and center strips, (the nozzles used in long, narrow planter areas.)

Valvette Systems is the worldwide leader in water conservation sprinklers and parts.
The ultimate in high-efficiency irrigation. No other sprinkler is comparable.

In commercial installations, both PRNs and LittleValve parts are rebatable under
the Southern California Metropolitan Water District program.    

Highlights with 11 pages of Videos & Pictures

(NOTE:  11 of the Videos are between 15 and 80 seconds long.  The 2 residential videos on page 7 are longer.)

Page 1, Page 2, and Page 3 - City of Calabasas, CA - Main Entry Planters
Page 4 - City of Calabasas, CA - Median Strip
Page 5a. Stay Green Landscape Co., Santa Clarita, CA - Main Office b. City of Tustin, CA - Median Strip
Page 6 - Cal-Trans - (Calif. Transportation Dept.) District 11 Maintenance yard, San Diego, CA
Page 7 - Two Residences:  a. Woodland Hills, CA    b. Santa Ana, CA
Page 8 - Avery Apartment Building on Albers Street, North Hollywood, CA
Page 9 - City of Thousand Oaks, CA - Park 'N Ride Facility
Page 10 - West Valley Christian Church & School, West Hills, CA
Page 11 Other PRN/LittleValve Combo pictures

When Combining the PRN with LittleValves, you have the most
          ACCURATE, EFFICIENT and FLEXIBLE sprinkler available anywhere in the World.


Because you have a completely controllable radius Distance range
from 20 ft - 26 ft  depending on pressure,

that can be brought all the way down to 18 inches - regardless of pressure.


You have an Arc range of 45° - 270°,
the Maximum Arc Range of all Rotating Nozzles on the Market today.

See the 1½ ft radius PRN/LittleValve Combo video at the bottom of this page

With the PRN/LittleValve combination, you can replace every spray nozzle [other than side strips and center strip nozzles] with proven water-saving, high-efficiency Rotating nozzles recognized by many municipalities and irrigation specifiers as the most efficient sprinkler nozzle available. Furthermore, the PRN/Little Valve combo eliminates as much as 95% - 98% of the water that usually ends up on adjacent streets and sidewalks - even in round planters and along meandering sidewalks. The videos and pictures on the next ten pages tell the whole story.

click here for the rotary comparison guide to see the vast differences
between the prn/littlevalve combo and the major competition

No other sprinkler - spray or rotary - handles curvy areas

like the PRN/LittleValve Combo.   

and certainly

No Sprinkler Anywhere in the World
has a Distance Range of 1½ feet up to 20 - 28 feet.

With the PRN/LittleValve combo sprinkler, you need to buy only the 2 models of PRN nozzles
- - Adjustable and Full Circle.  That's it!

Now you can stop buying and keeping around all those different bags of nozzles that drive you nuts.   Get rid of them!

You do not need any of the 5 - 6 different radius nozzles with all their many different arc patterns,
i.e. quarter circles, half circles, etc. etc.

You don't need the 5 - 7 different size adjustable nozzles offered by all the manufacturers,
and you don't need the other various arc and distance rotary nozzles available.

NOTE: For long, narrow areas, you can mix Toro's PSN side strips and left/right corner strips
with PRN nozzles because the flow rates are similar.  [PSN = Precision Spray Nozzles]

When using side strip and corner strip nozzles at short distances, i.e. 3' - 6',
you can also mix Hunter's SS530, LCS515 and RCS515 into PRN systems.

See Nozzle Catalogue sub-page.


Start the video to the right and watch the radius pattern with the longest PRN stream not exceeding 18 inches in its distance.

There is no standard Radius Nozzle on the Planet that can Maintain a distance of 18 inches except the PRN when connected to any Little Valve sprinkler part, a Little Tuffy pop-up sprinkler, or a Toro 570 pop-up with Precision Valve.

NOTE:  The PRN's 18 inch distance was set on April 5, 2013.  If this video is still up when you are watching it, that means the distance pattern has not changed since that date.

This 1 1/2 ft "distance project" was undertaken at the request of a certain customer in Northern California who has a long planter with an 18" width.  Other nozzles were tried and did not perform satisfactorily.  At this time, it appears that the PRN/LittleValve Combo is the answer.

We also are familiar with a project installed in the Summer of 2013 where the PRN radius distance has stayed at 14 inches.  See Woodland Hills residence on sub-page 7 - about 1 minute into the video.

Page 1

PRN/LittleValve Combo - Highlights and Pictures

Main Entryway Planter into Calabasas City Hall

12" Toro Pop-up Sprinklers changed out with LittleValve
12" Toro replacement pop-up stems - Model no. POP1220

Phenomenal Edge Control

Main Planter at Entryway
to City Hall


The video above is looking from North to South.

The video to the left is looking from South to North.

In both videos and in the pictures below, you see remnants of water on the top of the curb but virtually no water in the street.

Even at curved areas, overspraying is not evident.

NOTE: After the change-out to PRN/LittleValve Combos, all 6 of the sprinklers running down
the center of the planter were no longer needed and were shut off.

The main entry planter is 15 feet wide.
Sprinklers and Flowers
Notice how dry the street is during this watering operation.
Sprinklers and Plants
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Page 2

18 ft. Diameter Circular Planter just South
of Main Entryway Planter 

Note: No water in the adjacent street with
just a very small amount on face of curb


Notice the flowers right against the
inside of the curb receiving ample water

Sprinklers and Flowers
NOTE: After the change-out to PRN/LittleValve Combos, all 4 sprinklers surrounding
the tree in the center of the planter were no longer needed and were shut off.

Videos of the circular planter seen above

2-Part Video

1st Half
2nd Half
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Page 3

The Other 3 Planters in Entryway Area to Calabasas City Hall

Main Entry Side Planter- East Side

After changing out to PRN/LV combos,
2 sprinklers were shut off.

Only with LittleValves can Rotary nozzles be closed off completely.

Notice in the video that there is a little water on the top of the curbs but how completely dry the street is

Sprinklers and Flowers

Main Entry Side Planter- West Side

2-part Video

NOTE: This video shows 2 PSN side strips mixed with PRNs.

Look carefully: After changing out to PRN/LV Combos, 5 sprinklers were able to be shut off (2 visible here.)

Only with LittleValves can Rotary nozzles
be closed off completely.

Sprinklers and Plants
8' X 18' Triangular Planter (in Entry area)


Radius distance of PRNs at narrow end is from 3 ft to 4 ft.

NOTE: The small amount of water in street
is due solely to a short surge when
the sprinklers are first turned on.
Sprinklers and Flowers

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Page 4

Two 9' X 12' Videos and Other Photos of Oval Planter Areas
in Median Strip near
South End of Parkway Calabasas, City of Calabasas, CA

Oval sprinklers were 12" Toro Pop-up Sprinklers changed out with LittleValve 
12" Toro replacement pop-up stems - Model no. POP1220  

Video - Southerlymost Oval Planter Area
Video - Northerlymost Oval Planter Area

NOTE: A month after the videos were taken, the center sprinkler in both ovals was shut off.

Both photos below are of the northerlymost oval

Sprinklers and Flowers Sprinklers and Flowers

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Page 5

a. Stay-Green Landscape Co. Santa Clarita, CA

The premier landscape company of the Santa Clarita Valley area
employing PRN/LittleValve Combo sprinklers in the interests of Water Conservation 

12" Rain Bird Pop-up Sprinklers changed out with LittleValve
12" Rain Bird replacement pop-up stems - Model no. POP1210  

Video Before Change-out

Before Photos

Sprinklers Sprinklers

Video After Change-out

After Photos

Sprinklers Sprinklers


b.     City of Tustin, CA
     Median Strip on Jamboree Road 

6" Rain Bird Pop-up Sprinklers changed out with LittleValve 
6" Rain Bird replacement pop-up stems - Model no. POP610  

Video Before Change-out

Before Photos

Sprinklers Sprinklers

Video After Change-out

Note: Water on street is solely from adjusting sprinklers prior to shooting video.

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Page 6

Cal-Trans - District 11 Maintenance yard, San Diego, CA
PRN/LittleValve Change-out - June 7, 2013

NOTE: Static pressure at this location is 135 p.s.i.

All sprinklers were male shrub adapters with female spray nozzles attached to riser pipes, which were
extended with ordinary 1/2" couplings. The change-out involved replacing the ordinary couplings with
LittleValve Couplings - Model no. CP050 and replacing the nozzles with Precision Rotary Nozzles.

Video taken prior to Change-out

Before Photos - water everywhere!

Sprinklers Sprinklers


Video taken After Change-out

NOTE: Water on sidewalk and in parking lot is left over from adjusting sprinklers after change-out along with residual
water from what you see above in "Before Change-out" video and pictures.

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Page 7

Residential Videos

The two residences on this Page 7 demonstrate the freedom LittleValve sprinkler parts give to professional landscapers and homeowners by gaining the ability to combine Precision Rotary Nozzles (PRN) with side strip nozzles - Toro's PSN 4 x 30 side strip for larger areas and Hunter's SS530 for smaller, tighter areas. Note also how helpful is the vast flexibility in distance ranges with the PRN/LittleValve Combo with its range of 20' - 26' down to 14 inches.

a. Woodland Hills Residence
PRN/LittleValve Change-Out - July, 2013

b. Santa Ana ;Residence
PRN/LittleValve Installed New in June of 2013

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Page 8

Avery Apartments on Albers Street, North Hollywood, CA
Nozzle Change-out Comparison on existing Little Tuffy Pop-ups - February 2014

DISCUSSION: This very large apartment building is brand new with another manufacturer's sprinklers originally specified. When it came time to install the sprinklers, because of the water-saving benefits of LittleValve parts and being listed on the So. Calif. Metropolitan Water District's (MWD) rebate list, the landscape architect (L.A.) changed the specs to Little Tuffys, which feature LittleValve pop-up riser stems. However, the contractor nor the city knew that when using LittleValve parts, one typically should use only 15' spray nozzles or rotary nozzles whose radius distances can be reduced down to less than 6 - 8 feet. Hence, the job was installed with standard size nozzles. The 2 videos below show Little Tuffys with their tremendous flexibility and distance ranges that the LittleValve provides, comparing Toro's Precision Rotating Nozzle (PRN) against standard radius spray nozzles. The videos also compare the use of Toro's Precision SPRAY Nozzle side strips (PSN 4 X 30) - for large areas - along with Hunter's SS530 side strips (5 X 30) - for smaller areas - against standard 4 X 30 side strips and smaller radius nozzles.

NOTE: Nozzle changeout performed in cooperation with Landscape Development, Inc., Valencia, CA.

1st Video: Little Tuffy pop-ups with standard nozzles.

2nd Video: Little Tuffy pop-ups with Toro PRNs and PSN side strips, Hunter 5 X 30 sidestrips, and Rain Bird 5-CST-B center strips.

NOTE:  This change-out resulted in the elimination of 8 of the original 44 sprinklers as well as almost complete elimination of any water on the adjacent walkways and no water lost to misting/fogging due to high pressure.

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Page 9

Park 'N Ride Facility in the City of Thousand Oaks, California

DISCUSSION: This parking facility is located on the east side of the 23 Freeway on Janss Road in Thousand Oaks, CA. The entryway divides the parking area into an east side and a west side. The east side was re-landscaped with a new sprinkler system approximately 6 months earlier using standard, non-LittleValve 12" pop-up sprinklers with standard spray nozzles in the narrow areas and large MP Rotator nozzles (Model 3000) in the wide areas. The west side was left vacant until a later date when new landscaping and new sprinklers were installed. The new sprinklers are comprised of LittleValve sprinkler parts and Precision Rotating Nozzles (PRNs.) The east side irrigation was not touched during the west side re-landscaping process.

The prior irrigation in both the east and west sides were 'Drip" systems, hence pressure and volume in both areas was and continues to be somewhat restricted.

1st Video: The non-LittleValve area, shows the existing irrigation on the East side.

2nd Video: The West side with PRN/LittleValve Combo sprinklers.

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Page 10

West Valley Christian Church & School
West Hills, California

Change-out took place in June of 2015. No sprinklers were added or moved. Most pop-up sprinklers were Rain Bird 1806s and the pop-up stems only were changed out with LittleValve 6" Rain Bird replacement stems - (model POP610.) Over half of the sprinklers were above-grade shrub-adapter types on Schedule 80 - PVC risers. These were fitted with LittleValve 1/2" Couplings - (model CP050)

All sprinklers then received Toro's Precision Rotating Nozzles (PRN) for radius-area nozzles
and Toro's Precision Spray Nozzles (PSN) side strips for long, narrow areas.

The results of this change-out are finalized in the Water Savings Reports
section of the Test Data & Water Savings Report tab.

Click here to go directly to that Water Savings Reports tab

Before Change-out

After Change-out

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Page 11

Other PRN/LittleValve Combo pictures

PRN watering at 6-foot radius. 
Radius was set on April 17, 2012 and has
never been adjusted.

Notice how low is the trajectory of the PRN.
Lowest trajectory of all rotating nozzles, which
translates into having the most wind resistance
of any rotary on the market.

PRNs on a slope


Street Median on the Sunset Strip
West Hollywod, CA 
Raised Planter is 12' wide
Mixture of PRNs in middle, 15-ft PSNs on perimeter.
Radius of PRNs is set at only 6 feet.
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