This type of system simply consists of two positive displacement pumps mechanically interconnected by one single shaft, one larger working as a motor and powering the smaller one which sucks and injects the concentrate.

System will run upon water flowing through system.
A foam Dosing skid included:
- Atmospheric storage tank (to store the foam concentrate)
- Foam Dosing Device
- Interconnecting piping and piping's components (to connect above item within the skid)

Advantage of foam dosing skid:
- Accurate mixing ratio
- Using either in stationary installation or mobile systems.
- No adjustment required.