MJJC Foam Cannon for Karcher K Series pressure washers only karcher k1 k2 k3 k4 k5 k6 k7, other brands pressure washers are not compatible Compatible for (All Karcher K Series)Pressure Washer, other brands are not compatible This foam cannon comes with one traditional plastic karcher k fitting and one extra 1/4 inch quick connection fitting With the two fittings, you can attach this foam cannon to all karcher k series trigger guns.