These are high quality Italian made foamers with the following specifications

Flow: 20 l/min., 60°C
Pressure: 2300 Psi (max. 2600)
Detergent Metering: Adjustable
Inlet: 1/4” Bsp F
Tank Size: 1 Litre
Nozzle: 1.25mm & 1.5mm

It also comes with connector to fit most electric Karcher brand pressure washers as per the photo below