If you want the thick, luxurious soap found at professional car washes, look no further than Karcher’s foaming soap applicator. Simply add detergent concentrate to the canister and top with water. This accessory turns your pressure washer into a personal car wash! Connects directly to the spray gun on select Karcher electric (K1700 to K2000) and gas (up to 4000 psi) pressure washers. Compatible with most brands of quick connect-equipped pressure washers rated to 4000 psi.