These packages are designed for the ORIGINAL KARCHER GUN AND WAND. These are not for use with an aftermarket gun. You will need different connections for that application.
I have bought and tested every current Karcher pressure washer. These are the quick disconnects that I found helpful to aid you in quickly setting up and breaking down your Karcher, Wand, and adding a foam cannon if possible. (K1700 and K1800 cannot accept a foam cannon with the OE gun without the wand. The K2, K3, K4 & K5 currently not supported at all for QDs.)
You have two options here.
Option 1 - All Brass Quick Disconnects: Select the Karcher model pressure washer you have and it will default to the package you'll need.
Option 2 - Stainless Couplers and Garden Hose Connections: I prefer to have as much stainless as possible. At this time, there are some connections that aren't available in stainless and only in Brass or Zinc Plated Brass.
*Both options will include connections for the stainless steel wand attachment and necessary connections to add an aftermarket foam cannon for models K1900 only. The other models won't accept a foam cannon unless you attach it to the end of the wand.
Note: QUICK DISCONNECTS DON'T HAVE A PUBLISHED WARRANTY. These are wear and tear items. All QDs are available a la carte here. I would recommend having some back-ups for when they wear out.