STIHL SG 20 Manual Backpack Sprayer – 4.75 Gal | 4247 019 4902

The STIHL SG 20 Manual Backpack Sprayer is a professional backpack sprayer designed for accurate, controlled application of approved liquid compounds in landscaping, property maintenance, horticulture, vineyards, small tree farms, and other outdoor applications.

With a 4.75-gallon translucent tank, separate pressurized fluid reservoir, adjustable support harness, and approximately 40 PSI working pressure, the SG 20 is designed to maintain consistent spraying performance while remaining comfortable enough for extended use.

STIHL Part Number: 4247 019 4902
Also formatted as: 4247-019-4902 and 42470194902

STIHL SG 20 Specifications

Professional Manual Backpack Sprayer

The STIHL SG 20 is designed for users who need a portable manual sprayer with dependable pressure control but do not need a gasoline-powered or battery-powered application system.

The backpack configuration allows the operator to carry up to 4.75 gallons of solution while keeping both hands available to operate and position the spray lance.

Typical applications can include:

• Landscape maintenance
• Property maintenance
• Vineyards
• Small tree farms
• Horticultural work
• Farm and acreage maintenance
• Application of approved herbicides
• Application of approved pesticides

Always verify that the material being applied is approved for use with a manual backpack sprayer and follow the chemical manufacturer's label.

4.75-Gallon STIHL Backpack Sprayer

The SG 20 uses a 4.75-gallon translucent tank, giving users enough capacity for substantial spraying work without requiring constant refilling.

The translucent design also makes it easier to monitor remaining solution during operation.

Separate Pressurized Fluid Reservoir

One of the most useful design features of the SG 20 is its separate pressurized fluid reservoir.

The system is designed to help maintain consistent working pressure rather than requiring the entire main tank to function as the pressure chamber.

This helps provide predictable spraying performance throughout the job and through refill cycles.

40 PSI Working Pressure

The supplied SG 20 specifications list approximately 40 PSI working pressure ±10%.

Maintaining consistent working pressure helps provide more predictable liquid delivery during professional spraying applications.

Adjustable Backpack Support Harness

The SG 20 uses an adjustable support harness designed to distribute the sprayer's weight across the operator's shoulders and back.

This is especially important once the 4.75-gallon tank contains liquid, since the application material contributes significantly to the total operating weight.

Durable Hose & Spray Lance

Current STIHL product information identifies the SG 20 with a fabric-reinforced pressure hose and fiber-reinforced spray lance.

These components are designed for the repeated handling expected during professional landscaping and property-maintenance work.

STIHL SG 20 for Herbicide Application

The SG 20 can be used to apply suitable herbicides when the product being applied is specifically approved for that application method.

Always follow the herbicide manufacturer's label regarding concentration, application rate, required protective equipment, environmental restrictions, and cleaning procedures.

STIHL SG 20 for Pesticide Application

The SG 20 can also be used for approved pesticide applications where a manual backpack sprayer is permitted by the chemical label.

Do not assume that every pesticide is suitable for every sprayer, nozzle, pressure, or application method.

STIHL SG 20 for Vineyards & Tree Farms

The backpack design makes the SG 20 useful in settings where operators need to move through rows, landscaping, or other areas where wheeled spraying equipment may be impractical.

Applications can include smaller vineyards, tree farms, landscaped areas, and similar properties where portable controlled spraying is required.

Manual SG 20 vs. Powered STIHL Sprayers

The SG 20 is a manual backpack sprayer. It does not use a gasoline engine or battery.

That makes it fundamentally different from powered STIHL sprayers such as gas-powered mistblowers or battery-powered sprayers.

The SG 20 can be an excellent choice where simple operation, lower equipment weight, manual pressure control, and portability are priorities.

STIHL SG 20 Price & Availability

If you're comparing the STIHL backpack sprayer price or looking for a STIHL SG 20 for sale, use the current price and availability displayed directly on this product page.

This listing is specifically for the STIHL SG 20 Manual Backpack Sprayer, part number 4247 019 4902.

STIHL 4247 019 4902

The SG 20 may be identified using several part-number formats:

• 4247 019 4902
• 4247-019-4902
• 42470194902
• STIHL 4247 019 4902

These formats refer to the SG 20 manual backpack sprayer covered by this listing.

Important Use & Safety Information

Always read and follow both the STIHL instruction manual and the label for the liquid product being applied.

• Use only approved liquids suitable for the sprayer and intended application.
• Follow all mixing and application instructions on the chemical label.
• Wear the personal protective equipment specified by the product manufacturer.
• Avoid spraying people, pets, food, open water, or sensitive areas unless specifically permitted.
• Never leave mixed chemicals stored in the sprayer after use.
• Rinse and maintain the sprayer according to STIHL instructions.
• Follow applicable federal, state, and local regulations.

Frequently Asked Questions

What is the STIHL SG 20?

The STIHL SG 20 is a manual backpack sprayer designed for professional landscaping, property maintenance, horticulture, and other approved liquid-application work.

How many gallons does the STIHL SG 20 hold?

The supplied product specifications list the SG 20 with a 4.75-gallon tank capacity.

What pressure does the STIHL SG 20 operate at?

The supplied specifications list approximately 40 PSI working pressure ±10%.

How much does the STIHL SG 20 weigh?

The sprayer itself weighs approximately 12.2 lb. before liquid is added.

Is the STIHL SG 20 battery powered?

No. The SG 20 is a manual backpack sprayer and does not require a battery or gasoline engine.

Can the STIHL SG 20 spray herbicide?

It can be used with approved herbicides when the chemical manufacturer's label allows application using a manual backpack sprayer. Always follow the product label.

Can the STIHL SG 20 spray pesticides?

It can be used for approved pesticide applications when the pesticide label permits use with this type of equipment.

Does the SG 20 maintain constant pressure?

The SG 20 uses a separate pressurized fluid reservoir designed to help provide consistent working pressure during operation.

Is the STIHL SG 20 good for vineyards?

Yes. The portable backpack design makes it suitable for appropriate spraying work in vineyards, small tree farms, landscaping, and similar settings.

What is the STIHL SG 20 part number?

The supplied manufacturer part number is 4247 019 4902.

Is 4247-019-4902 the same as 4247 019 4902?

Yes. They are two formatting styles for the same STIHL part number.

How much is a STIHL SG 20 backpack sprayer?

Check the current price displayed directly on this product page. Pricing and inventory may change.

STIHL SG 20 Manual Backpack Sprayer – 4247 019 4902

Choose the STIHL SG 20 when you need a professional manual backpack sprayer with a 4.75-gallon tank, approximately 40 PSI working pressure, separate pressurized fluid reservoir, durable spray components, and adjustable carrying harness for controlled outdoor liquid applications.