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Frequently Asked Questions

About our LittleValve Water Saving Sprinklers, Sprinkler Parts & Nozzles.

We try to anticipate questions you might have about our PRODUCTS and provide the answers here. If you need additional information send email to

1. Can LittleValves be purchased already installed into other manufacturer's products?
Yes, they can be custom-ordered at irrigation distributor outlets in Toro© 570 Pop-ups and Irritrol© I-PROs - 4" , 6" and 12" sizes.  Additionally, in case quantities only, we can arrange for Rain Bird© 1800 series and Hunter© Pro-Sprays to be changed out with LittleValve IFRs and shipped to the customer or to his local distributor.  We handle all the arrangements, just contact us at
(866) 200-8590 - Pacific time. 

2. I see that your pop-up replacement stems are all 4", 6" and 12" with just one exception. Do you sell replacement stems for 2" and 3" pop-ups? 
Not really.  There is only one smaller than 4" and that is a Toro 3" stem. 

3. Are LittleValve products available at any retail outlets? 
No, but they are available or can be special-ordered from the irrigation distributors listed under the "Products Catalogue/Contractors Info" tab.  Most of the companies listed there do sell retail even though their primary customers are contractors, cities, and apartment/condominium maintenance staff.  Most irrigation distributors have a much larger and varied selection than does any retail store. 

4. What is the warranty for your products?  
The white wiper seals for the Little Tuffy pop-ups is 2 years.  For everything else we make including the other parts of the Little Tuffys, the warranty is 5 years.  The warranty does not protect against any mistreatment of the parts or being damaged by gardeners, being run over by vehicles and etc. 

5. When adjusting a 15-ft nozzle down to less than a 15-ft radius, does that affect the so-called 'matched precipitation rate'? 
The correct answer is 'Yes'.  However, there are several caveats to consider when asking that question as it is not a 'cut & dry' subject. 

The subject of matched precipitation rates is only brought up in the context of saving water as the concept of having matched precipitation is supposed to result in just that: saving water by the water being applied more evenly regardless of distance and nozzle size.

However, the MWD trials resulted in average water savings over the year of 30% on typical spray systems with the use of LittleValve sprinkler parts and they do not provide matched precipitation.  For each trial, the LittleValve area using only 15' nozzles was paired against a non-LittleValve area.  The non-LittleValve areas used 12-ft MPR nozzles in 12' wide median strips hence the non-LittleValve areas were installed with matched precipitation in mind.  Yet, the LittleValve areas achieved higher water savings without matched precipitation because of several factors: Overspraying was eliminated, misting and fogging was eliminated and the bigger, fatter and heavier water droplets that come from 15' nozzles penetrated the soil deeper, diffused in the soil wider and were much less affected by wind drift than smaller radius nozzles.  

The bottom line is that the benefits of LittleValve parts in conjunction with 15' nozzles override the singular benefit of matched precipitation. 

Another matter in this regard is that matched precipitation in small spray nozzles is very difficult to achieve. Matched precipitation is very important in larger rotors.  Without matched precipitation with gear-driven rotors, you will have noticeably uneven watering.

6. I noticed in the Pop-up Riser Stem Replacement section some points about "Ratchet Rings".  What are ratchet rings and what are they for?
Ratchet rings are always located at the base of the pop-up riser stem.  Ratchet rings keep the sprinkler and the nozzle facing the same way every day.  When you rotate a stem in an assembled pop-up sprinkler, you will hear and feel a click-click-click.  That noise is the notches in the ratchet ring engaging and disengaging with the inner ribs inside the housing.  Without ratchet rings, one morning the sprinkler faces east, the next morning, it will face southwest or somewhere.

7.  Why do Valvette Systems' sprinklers - LittleValves - save more water than other sprinklers on the market?
The answer is the In-stem Flow Regulator (IFR) technology, the biggest change to sprinklers since plastic sprinklers came out in the 1960's. IFRs provide on/off AND flow control to each sprinkler AND pressure control as well.  That means overspray goes away because you dial in your distance using far less nozzles than before.  FYI, overspray is the number one reason for runoff.  Water-wasting misting/fogging - due to high pressure - also goes away because the LittleValve IFR allows for pressure regulation regardless of the inlet pressure hence, LittleValves are not limited as are ALL other pressure regulating pop-up stems and devices.  An important fact with pressure regulating stems is that the apparatus used by all the other manufacturers for pressure regulation goes into the middle of the stem and creates an obstruction, which means that sooner or later, that stem is going to get clogged up with debris that will easily get hung up on the device.  When that happens, you buy a new sprinkler or, if you're smart, you will just buy a LittleValve replacement stem and get the LittleValve out of the deal.  But, ONLY with LittleValves, can you get the pressure regulation you need and yet be able to have an unobstructed water passageway that allows all debris smaller than 1/4" to pass through.  BTW, pressure regulating sprinklers by other manufacturers cost substantially more than regular sprinklers. Further, pressure regulation apparatus for above-grade sprinklers is bulky and not really very common and rarely used.  With LittleValve parts, you always have your pressure regulation regardless of what part you buy.

Remember:  If you're not using LittleValves, you're not doing everything you can to save water.

Please note there are many irrigation professionals that will assert that the LittleValve provides pressure compensation, not pressure regulation.  We will not argue that point nor even disagree with it.  However, the end results practically come out the same, which is primarily to avoid water-wasting misting and fogging.  Hence, we consider the point mute.  We say "practically" because there is one big difference in the final results:  We have found that the spring-loaded pressure regulating devices used by the other manufacturers lose their ability to maintain the desired pressure after 18 months to 2 years.  Our pressure regulation does not involve springs nor any moving parts except for the LittleValve screw itself, which is intentionally manually moved for on/off/distance control, therefore it will never wear out.

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