I think it is 20litre in size. It still sprays well and builds up the pressure using the hand pump. You can see there is an issue with a crack in the spray rod. I have taped it and this appears to have worked.
It has served me well but the back straps have never been much use. I always used it by placing it on the ground.
Yours if you want it
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Large Manual Pressure Sprayer (Llanbister Road)
This offer has been gifted to someone and is no longer available.