If you want to add soap solution at high pressure try this !!

Externally Adjustable Injectors With Extended Water Flow Ranges. They Come Complete With Ceramic Weight, 2.5M Pvc Tube & Foot Filter. Max Press 250 Bar.

Especially useful in high pressure pump discharge line applications where it is desired to keep pressure loss to a minimum. Suitable for a wide range of flow rates. Built-in check valve to prevent backflow into chemical container. C/w external adjustable screw. Particularly useful for pumps with low output pressure.