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Stainless Steel Backpack

Stainless Steel Backpack


This 18 litre backpack sprayer, with 6 bar maximum working pressure, is the perfect helper for professional users and homeowners alike. It offers plenty of comfort, such as a smooth-running piston pump made of brass and an ergonomic shut-off valve with pressure gauge and integrated filter.
Regular price £220.00 GBP
Regular price Sale price £220.00 GBP
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Product Description

Our range of backpack sprayers are of the highest quality designed for professional use but are very much suited for both home and industrial applications. This Stabilus knapsack sprayer is manufactured from stainless steel, has a brass piston pump and is fitted with FPM seals.

This unit is designed to be used with many types of different chemical liquids including many mosskillers, weedkillers, alkaline products (pH <9), plant protection products, forming oils, low viscosity mineral oils. This backpack sprayer is most commonly used for landscaping tasks such as forestry work and the care of trees within the garden environment.

Product Specification

  • Unit Height: 55cm
  • Unit Weight: 5.2kg
  • Maximum Operating Pressure: 6 BAR (87 psi)
  • Operating pH range: 1-9*
  • Maximum Fill: 18 litres
  • Tank Capacity: 19 litres
  • Tank Ullage: 1 litre
  • Tank Construction: Stainless Steel
  • Carry Position: Can be carried on back or by hand
  • Maximum Flow: 2 litres/min @ 2 BAR (with supplied nozzle)
  • Lance: Brass, 50cm length and 360° rotatable
  • Padded carrying straps and back padding
  • 20 years spare parts supply GUARANTEED
  • Seals: FPM - Synthetic rubber with high elasticity properties which makes it a very good product for the protection of seals and O-rings. FPM seals are are highly resistant to hydrocarbons, oils, strong acids, aromatic and chlorinated solvents and has a high temperature resistance.

*We recommend a full compatibility test with aggressive chemical solutions. If unsure then send us the safety data sheet (MSDS) for the product you wish to use and we will check compatibility and recommend an alternative sprayer if necessary.


Can this sprayer be used with all types of acidic chemical?
Whilst this sprayer can be used with acidic products it is has been designed with forestry, landscaping and garden applications in mind. It can therefore be used with a wide range of chemicals however we can't guarantee that this sprayer is compatible with any type of liquid just because it is classed as an acid. Please remember that it is not just the pH that determines which sprayer can be used but the active ingredients. We therefore recommend that if there is any uncertainty unsure then send us the safety data sheet (MSDS) for the product you wish to use and we will check compatibility. If the product is not compatible then we will recommend an alternative sprayer for you.

What does Tank Ullage mean?

Ullage is the name given to the gap between the maximum fill and the total tank capacity. It is important with sprayers as the larger the ullage is then the more space there is for compressed air. The more compressed air you have then the longer spraying time you have before you run out of pressure. Given the design of a knapsack sprayer the ullage is not as important as with a compression sprayer which is why, generally, knapsack sprayers will have a smaller ullage to tank capacity ration than a compression sprayer.

Can this sprayer be used with your long telescopic lances?

Yes. This sprayer can be used with both our 2.5 metre, 3.2 metre and 5.4-metre telescopic lances as well as the shorter telescopic lances that we have listed in the accessories tab above.

Can I change the nozzle?

We have a range of over 20 different nozzles most of which can be used with this sprayer. If you are uncertain which additional nozzle would suit your needs then just let us know and we can assist.

What guarantee do I get with this sprayer?

You get a full 12 months with mechanical breakdowns so, providing that the sprayer is being used as intended, then if something snaps you tell us and we replace the part for you. If it's damage caused by a chemical compatibility issue then we will cover the damage providing that we have confirmed the chemical compatibility with the sprayer. When it comes to the availability of spares, this is guaranteed for 20 years from the date of purchase.

Our Review

Our Stabilus is a knapsack sprayer with an 18-litre capacity stainless steel tank and 6 BAR maximum spraying pressure which will give a maximum flow rate of 2.0 litres per minute.

When you receive your sprayer, the first thing that you see is the box and this gave me a very good first impression; brightly coloured with plenty of good quality, informative photos and a construction that felt strong enough to hold and give some protection to the contents. I also liked the way that the carry handle for the sprayer tank had been integrated into the box so that you use it to carry the box itself. I thought that this was a nice touch and somewhat unusual.

Upon opening the box the first thing I was confronted with was the instruction manual, or rather, manuals. 48 pages in the first manual, 7 of which are in English (the rest are a range of other languages showing how popular these sprayers are around the world). The manual tells you pretty much everything that you need to know from a welcome message and safety notices through technical information, assembly instructions, care, maintenance and warranty information and, don’t forget, the faults guide. There is also a leaflet containing metering and liquid distribution information and another sheet showing an exploded diagram of the sprayer giving part numbers should you need to order any spare parts.

Putting the paperwork to one side, it was time to have a look at the sprayer. Everything was nicely packed around the tank so to remove the sprayer from the box only required a gently pull and wiggle on the handle and the tank lifted out easily. My first impression of the sprayer is that it felt substantial and it looked great, after all it is made of stainless steel so it’s very shiny and just looks like a sprayer should look. The hose and sprayer lance handle are already attached to the tank so assembly really is quick and easy. The only, very slight, issue I have is that the sprayer can only be pumped with your left hand. Due to the construction, it can’t be set either left or right handed. Anyway, moving on, the lance just needs to be screwed onto the lance handle and the two shoulder straps attached. I have found some shoulder straps to be a little fiddley to attach to the sprayer tank but these were quite straight forward. The whole tank assembly took less than 5 minutes from opening the box to fitting the second shoulder strap.

As with all the knapsack sprayers within the Mesto range, the tank has a wide neck which makes filling easy and the lid was very easy to open to close. There is a plastic filter which, I would recommend, leaving in place so that nothing can be added to the tank that could block the nozzle when spraying. So, with tank filled I put the sprayer on and with the padded shoulder straps I thought the sprayer was very comfortable and sat well on my back. There is plenty of adjustment in the shoulder straps so all shapes and sizes should be well accommodated.

After all of this, I was ready to spray. It took 20 compressions of the tank handle and I was at the maximum 6 BAR. This is a very impressive pressure as many sprayers, only reach 3 BAR so I was interested to see how powerful 6 BAR was. The answer, the liquid does come out with some force and is noticeably stronger than 3 BAR sprayers. As the pressure is built within the compression tube, inside the tank, there is no pressure release valve and you can open the tank lid whilst spraying if you wish. This may sound pointless but it does mean that you could have the tank filled whilst spraying. This would mean that you don’t have to stop, remove the sprayer, decompress, refill, put the sprayer back on and pressurise. This could be quite a time saver.