Solo Backpack Sprayer Deluxe 4 Gallon with Diaphragm Pump

Qty Price
1 – 2 $124.99
3 + $114.99
Item # 475D
Ship Weight 11.80 lbs
Stock Status 24 left, while they last!

4 gallon high-density polyethylene tanks with ultra-violet inhibitors allow for unmatched durability and ultra-violet protection.

Large 4.25-inch fill opening for easy filling and cleaning. Shut-off valve and wand with an overall length of 28-inch for hard-to-reach places. Padded shoulder straps for greater comfort.

Diaphram Pump Sprayer - Handles the Wettable Powders (WP's) that a Piston Pump won't. Chemically resistant Viton seals for long life and durability. The 475D is capable of producing a wide pressure range of up to 60 psi. Easily and effectively handles disinfectants, fertilizers, herbicides, pesticides, and formulations for tree, shrub and plant protection.

Deluxe Models: Both Piston and Diaphragm sprayers are available in Deluxe form which include addition of a 4-position adjustable pressure cylinder, fold away pump handle, brass adjustable nozzle, carry handle and a waist belt.

The diaphragm is now made with a new Tivilon® material which can also handle bleach solutions. The spring in the shut-off valve is now stainless steel. Visually the only difference is a blue locking tab versus a red locking tab on the shut-off valve.

Product Information


  • 4 gallon
  • Fill neck opening 4.5in
  • Diaphragm pump
  • 60psi working pressure
  • Fold away handle
  • Padded straps
  • Adjustable brass nozzle
  • Dry weight 14 Lbs

Product Features

  • Sprayer has wide mouth for easy filling
  • Padded shoulder straps for carrying comfort
  • Pressure regulator inside tank on pressure cylinder to set pressure to 4 settings
  • Fold away handle to allow for easy storage


Manufacturer supplies a one year warranty.


QUESTION: Will the plastic material last?

ANSWER: Only high density polyethylene is used. The material is chosen for high molecular weight, high impact strength, and excellent resistance to chemicals and stress. Ultraviolet inhibitors are used in the material to reduce deterioration caused by sunlight.

QUESTION: Can I use weedkiller and insecticide in the same sprayer?

ANSWER: In theory you can, if the sprayer is thoroughly cleaned out with ammonia: water solution of 1:25. In practice, the use of both types of chemicals in the same unit is not recommended as the risk to the plants can be high. Use caution when handling any type of chemical and when cleaning your sprayer.

QUESTION: Does the unit require constant pumping?

ANSWER: The well-designed level action greatly reduces the pumping effort. The pressure cylinder within the tank has a hydraulic effect. Liquid from the pump compresses air in the pressure chamber which allows irregular pumping action, yet results in steady spray at the nozzle.

QUESTION: Does the pressure gauge set the pressure?

ANSWER: The pressure gauge does not really set the pressure, it tells you at what pressure you are operating. Pressure is determined by pumping it.

QUESTION: Can you use bleach in this sprayer?

ANSWER: No, the vendor says it ruins the o-rings.

Customer Reviews

Review Summary (Based on 1 Reviews)

Overall Rating: 5/5

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from TN



I have used a Solo Back Pack Sprayer for 10 years now. There is no better one in the market today. I love how easy it is to pump up to spray, one pump to the other brands three will do the trick. If you ever use this sprayer you will not use any other kind. Cynthia M. Grounds Management Supervisor, City Parks and Recreation