SR 450 - $699.95 DSRP


Distributor Suggested Retail Price SR 450 DSRP:  $699.95

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)
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! 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

    •5.2 oz. bottle makes 2 gallon mix

    •6.4 oz. bottle makes 2 1/2 gallon mix

    •12.8 oz. bottle makes 5 gallon mix

    STIHL recommends a mix of 50:1 high-quality 89 octane or higher unleaded gasoline to STIHL engine oil. This same mix ratio should be used during break-in.

For Your Safety
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    Sleek Line Glasses
    A lightweight frame made of nylon offers the ideal combination of durability and comfort. Rubber temple tips and nosepiece offer a pressure-free fit behind the ears and protection from slippage on the nose bridge area. Protective lenses filter 99% of harmful UV rays.
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    Work Gloves
    Double palm layer and finger tips provide long life. Breathable polyester back and knit wrist provide snug fit. One size fits most.

Are You Ready for a STIHL?

SR 450 is rated 4.3 out of 5 by 18.
Rated 5 out of 5 by from Great Performing Sprayer I purchased this sprayer to apply pest control in my yard. The SR450 is powerful enough to get high into my privacy hedges and trees. It also works great to move leave when I just need a reliable, powerful backpack blower.
Date published: 2017-06-22
Rated 5 out of 5 by from Great product Love the product and works as expected. The diffusers on the end of the wand do not attach very securely. It would be nice if they had a better locking mechanism. The price is a bit high also, but it is a good product.
Date published: 2017-06-12
Rated 5 out of 5 by from Great for diy mosquito control It's a little heavy with a full tank though does a great job with mosquito control. This sprayer will pay for itself in one season of treating your outdoor space for mosquitos.
Date published: 2017-06-03
Rated 1 out of 5 by from Sr450 backpack mister This product has a defective tank. This tank will eventually leak. When I say leak I mean like a broken pipe, extremely bad. The chemical you put in the tank will leak all over your legs and lower bank. We bought 3 of them for our company and all 3 eventually leaks.
Date published: 2017-04-30
Rated 5 out of 5 by from Had a leak problem at the chemical tank from dealer but I was able to solve it. works good after I found a weeping leak. I think the dealer had installed the low volume filter that I ordered with it. It leaked a little at the tank connection. I removed the tank and cleaned up the gasket (it wasn't noticeably dirty) but when i reassembled it, the machine worked great.
Date published: 2016-08-30
Rated 5 out of 5 by from The best and most reliable mister/blower on the market. Stihl SR 450 is a beast period. It is great for large areas and extra large areas. If you aren't using this product you are selling yourself, your company, and your customers short. The Stihl SR 450 has more power to get way into wooded areas and up into trees and dense foliage. When full it can be a bit heavy, but the upside is you can get alot more area serviced. If you own a pest control company and this is not in your arsenal of tools. You are not on the cutting edge of premier service. Buy it now!
Date published: 2016-06-03
Rated 4 out of 5 by from works good but is too heavy and it lid is hard to get tight my unit does the job beautifully but is too top heavy when full. the lid is sometimes hard to get screwed down and leaks while in use. i'd like to see stihl engineer the spray tank to operate from below the blower utilizing a pump somehow.....
Date published: 2015-10-19
Rated 5 out of 5 by from Great for Mosquito Control This misting blower does it all. I have treated my yard once so far with Talstar P and I can go outside in the evening and not get bit at all! I know other reviews say the unit is heavy, but hey 4 gallons of water on your back and a backpack blower are not going to be the lightest thing to carry around. I recommend filling it up on a sturdy table or truck tailgate, and then slipping the straps on over your shoulders after you have started the unit. I can't wait to to use this for fertilization and weed control soon. This product is not cheap, but it will pay for itself this summer by not having to hire pest control to treat my yard for mosquitos. Make sure you use Stihl's Motomix for fuel on all of your Stihl products as this will extend the warranty. It has a 2 year shelf life too. Not bad!!
Date published: 2015-08-10
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