SR 450 - $699.95 DSRP


Distributor Suggested Retail Price
SR 450

DSRP: $699.95

Quantity:

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
We Also Suggest
  • Reflective Safety Pants Zoom
    Reflective Safety Pants
    When it comes to safety, visibility is key. STIHL Reflective Safety Pants provide excellent reflective exposure while working when visibility is poor. Available in two sizes – M/L and XL/XXL – these pants are designed with bright, contrasting colors for maximum visibility. Mesh legs and an elastic adjustable waistband provide additional comfort and zipper sides allow for simple removal. STIHL Reflective Safety Pants meet ANSI/ISEA 107-2010 Standard for Class E requirements and earn a Class 3 reflective rating when worn with the Class 2 reflective vest.
  • HP Ultra 2-Cycle Engine Oil Zoom
    HP Ultra 2-Cycle Engine Oil
    HP Ultra is a fully synthetic 2-cycle engine oil specially suited for high performance chainsaws and power tools. This oil has outstanding engine cleaning characteristics, plus “ultra” superior lubricating qualities in comparison to other 2-cycle engine oils. It is ideal for use in STIHL 4-MIX® engines. This oil is biodegradable, degrading by 80% in 21 days.

    •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.

  • No-Spill® Fuel Containers Zoom
    No-Spill® Fuel Containers
    The latest advance in gasoline can technology is here with No-Spill® fuel containers. Featuring a special treated body for low permeation, thumb-button flow controls for easier pouring, and a wide and stable base design to reduce upsets, No-Spill® fuel containers help ensure that the gasoline goes into your tank, not on the ground or into the air. Fill even smaller-sized tanks without spilling – flow stops automatically when the tank becomes full. With 1¼-gallon, 2 ½-gallon and 5-gallon sizes available, you’re sure to find one that fits your needs. Ask your local STIHL Dealer about No-Spill® fuel containers. Don’t settle for anything less.

    Meets California Air Resources Board Phase II requirements for sale or use in California. No-Spill® gasoline cans are tested and certified to ASTM F-852-99 standard specification for portable gasoline containers for consumer use and our diesel and kerosene cans are tested and certified to ASTM F-976-02 standard specification for portable kerosene and diesel containers for consumer use.

For Your Safety
  • Sleek Line Glasses Zoom
    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.
  • STIHL® Pro Mark™  Hearing Protector Zoom
    STIHL® Pro Mark™ Hearing Protector
    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
  • Reflective Safety Vest Zoom
    Reflective Safety Vest
    Class II reflective vest that is required for working along highways meets ANSI/ISEA 107-2004 standard. Longer tail in the back provides maximum reflective exposure for users running backpack blowers. Two front pockets and one chest pocket provide utility for carrying necessary items. Available sizes: Medium, Large, X Large, XX Large

Are You Ready for a STIHL?

SR 450 is rated 4.1 out of 5 by 27.
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
Rated 5 out of 5 by from Bought mine a couple months ago Haven't had any issues yet, it appears heavy at first, but you have the tank on your back, so it'll lighten as the product disperses.
Date published: 2017-07-07
  • y_2018, m_6, d_21, h_4
  • bvseo_bulk, prod_bvrr, vn_bulk_2.0.8
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_27
  • loc_en_US, sid_sr450, prod, sort_[SortEntry(order=FEATURED, direction=DESCENDING), SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_stihl