SR 450 - $699.99 DSRP


Distributor Suggested Retail Price
SR 450

DSRP: $699.99

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Reserve with STIHL Express for In-Store Pick Up

A powerful backpack sprayer/duster that easily converts from liquid to granular applications.

For both the distribution of liquid or solid insecticides, fertilizers, or herbicides, the low-emission, fuel-efficient STIHL SR 450 Backpack Sprayer has a larger, more powerful engine that provides a spray range 20% wider than previous models, taking 20% less time to spray the same area, depending on application. The SR 450 easily converts from misting to dusting applications without special tool...Read More
Print Spec Sheets
SR 450 Specifications
WEIGHT WITHOUT LIQUID 12.8 kg (28.2 lbs.)
DISPLACEMENT 63.3 cc (3.86 cu. in.)
ENGINE POWER 2.9 kW (3.9 bhp)
FUEL CAPACITY 1700 cc (57.5 oz.)
CONTAINER CAPACITY 14.0 L (3.7 gals.)
AIR VOLUME With Tubes: 920 m3/h (542 cfm)
AIR VELOCITY 90 m/sec. (201 mph)
MAXIMUM SPRAY RANGE Horz.: 14.5 m (48 ft.)
Vert.: 13.0 m (43 ft.)
The pressure pump kit is recommended for applications in which the spray tube is held at an upward angle of more than 30 degrees in order to maintain a consistent discharge rate.
Model Features
  • Zoom
    Multi-Function Control Handle
    Having easy access to all of the controls on one comfortable handle makes it easy to complete tasks so the operator’s hand never has to leave the handle.
  • Zoom
    Anti-Vibration System
    The STIHL anti-vibration system helps reduce operator fatigue and provides a more comfortable working experience.
  • Zoom
    Adjustable Support Harness
    STIHL backpack blowers and sprayers are equipped with an adjustable support harness that distributes weight evenly across the shoulders and back, reducing user fatigue.

    See it in action!

Important Information
Note: STIHL recommends use of fuel with no more than 10% Ethanol content. Using fuel with greater than 10% Ethanol content may cause damage to your equipment and may void your STIHL warranty. Learn More…
WARNING: Cancer and Reproductive Harm - www.p65warnings.ca.gov
ADVERTENCIA: Cáncer y Daño Reproductivo - www.p65warnings.ca.gov
WARNING! Improper use of any power tool may cause serious or fatal injury. Read, understand and follow carefully the operating and safety instructions in your instruction manual before using such products.

STIHL products sold through U.S. STIHL Dealers are for distribution in the United States only.
Click to view the STIHL Limited Warranty Time Periods
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    •2.6 oz. bottle makes 1 gallon mix

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    Padded stainless steel spring wire headband maintains constant pressure. Easy to adjust. Noise Reduction Rating (NRR): 29. Meets ANSI S3.19-1974 standard.

    Colors available: Camouflage, Orange and Grey

Are You Ready for a STIHL?

SR 450 is rated 4.2 out of 5 by 28.
Rated 5 out of 5 by from A little heavy, but does a great job. I purchased this sprayer to apply mosquito insecticide. I am surrounded by large trees/woods and this sprayer was able to get the liquid up high where it needed to be. Once I learned how to control the amount of liquid and the rpm's things couldn't have gone better. For bushes/shrubs I found that less rpm's works best and doesn't damage the foliage. When needed the sprayer has the power to reach out a long way into the woods, I'd say about thirty feet or more. I am going to order the optional hip belt to help make things a little more secure. Great product. I have three Stihl chainsaws and now this sprayer, love Stihl.
Date published: 2018-07-12
Rated 3 out of 5 by from Miss the sr420 I got the SR 420 back in 2005. Are use that backpack like crazy. I’m a pest control operator and I used it for mosquito control. I only had to replace the pull string and the screen part where the smoke comes out. The shut off switch broke but it wasn’t worth fixing since I just have to turn the knob to choke. That was a brilliant piece of equipment. I had to replace it last year, 2017. That SR 420 lasted 12 years. I had to get the SR 450 because the SR 430 was not available and beggars cannot be choosy or‘s. Upon purchasing the SR 450, it seem to work pretty well initially. This year, it takes me forever to get the thing started. It won’t start like the SR 420 dead. Not my favorite piece of equipment. I do need to get the SR 420 fixed, if I can. But the SR 450, not that great.
Date published: 2018-05-31
Rated 1 out of 5 by from Plastic broke that attaches the harness to the frame Purchased this product 2 days ago, used it for the first time this morning to do 2 properties, no problem. Came home to do yard work at my own property, decided to use this as a leaf blower but when i lifted the sprayer up to put it on my back, the plastic broke off that holds one of the harness straps so now it’s junk. Can’t use this backpack sprayer with one strap (especially when full of liquid). It’s Saturday at 5pm on Memorial Day weekend and the dealer is closed (just my luck) until Tuesday now. So much for using this to spray my yard for mosquitos and ticks this weekend!
Date published: 2018-05-28
Rated 5 out of 5 by from STIHL Outstanding STIHL it speaks for itself ! This sprayer Performs Excellent !
Date published: 2018-05-16
Rated 5 out of 5 by from Machine is a beast! I bought my Stihl back in the spring of 2014 when I opened my company and I can tell you now finishing up my 4th mosquito season and servicing over 90 customers a month that this machine is practically bullet proof. Throttled out on an acre of property with nothing but English ivy it works like a champ. Use Stihl 2 cycle oil as recommended and change the plug every season and you'll be very happy. The diffuser design on the end could use some reworking, but a small tent bungee strap rigging on its fine.
Date published: 2017-09-13
Rated 5 out of 5 by from Awesome unit I bought one for mosquito control for my small Landscape Company yes it is heavy. However it does the job it starts up every time I have used mine all summer now and I have never had any significant issues.
Date published: 2017-08-29
Rated 1 out of 5 by from Leaks. Wow. Stihl. Brand new. 5th backpack I've used from Stihl. All the others worked flawlessly. This one blows. Motor is very strong but the water continues to leak in spite of turning off the nozzle. There needs to be a shutoff inside the tank. This would help in two ways: 1 you wouldn't have to premix chemicals in a secondary container 2 it would never leak. You're better than this Stihl.
Date published: 2017-08-19
Rated 5 out of 5 by from EXCELLENT VALUE *Heavy as other have said*Tank needs gallon- quart graduations not liter for USA sales*Will pay for itself quickly
Date published: 2017-07-13
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