This is the Marolex Axel 2ltr foam sprayer, it comes with three different interchangable inserts which allow the user to change the density of the foam being sprayed from the device. Foam is great for cleaning stubborn dirt and is extremely effective on vertical surfaces due the increase in contact time allowed by the foam between surface and cleaning agent.
 
After filling the foamer up with your chosen cleaning agent, repeatedly pump the sprayer to build maximum pressure for best result, it is immediately ready for use. The sprayer has EPDM seals which make it suitable for a large number of cleaning agents and shampoos.
 
Another great feature of this device is that when the foam nozzle inserts are removed it can be used like a standard sprayer as well. This foam sprayer can be used for washing garden furniture, shower cabins, oven hoods, ovens, carwashing and is great for cleaning car alloy wheels.