Solo 425

The style of the 425 is about as "trendy" as knapsack sprayers can get. It's of German origin and is full of the quality engineering and robustness you would expect.

We particularly like the stability of the metal stand at the base and find the weight of the water is positioned nice and high on the back when the sprayer is in use. But there is no carrying handle and the straps, though well padded, could be a bit wider for comfort.
The lance is good quality and a nice length but is fairly flexible. We like the positive movement of the trigger. "There shouldn't be a problem with this accidentally catching in the on position," says our tester. It is easy to swap the unit from right- to left-handed use.
The tank holds 15 litres and is made of robust, high-density polyethylene. The lid is strong and easy to grip. Ridges for the fingers to push against make turning the lid a doddle.
But removing the lid reveals a very shallow basket filter. On closer inspection we find holes around the rim. They should help the air escape as the tank is filled but the general consensus is the filter might lift out because it is so shallow. On the positive side, the filler hole is 108mm in diameter for easy filling.
The Solo 425 is capable of a wide pressure range and has four adjustable pressure settings of 15, 30, 45 and 60psi. An optional plug will give you a maximum 90psi. But the pressure is adjusted inside and we feel that is a step backwards. "What if you have a problem with it in the field?" enquires the tester.
And we have another problem. We are unable to turn the handle to the vertical position for safe storage. "We should be able to move the handle and then clip the lance to the handle but there is a metal bracket preventing the handle turning to the vertical," says our tester.

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