Genuine Part no 6.421-349.3 from an authorised Karcher dealer
Please click on Karcher / Pressure Washer Part category in our shop for many other Karcher parts
For select Karcher models including some HD 6/15 C and HDS 551 C
If you are unsure if this is the correct part for your machine please feel free to ask as many Karcher pressure gauges look similar