Karcher 2.642-189.0 O-Ring Set for Electric Pressure Washers The Karcher Promise: Cleaner. Quicker. Best-in-class cleaning performance. O-rings spare part kit for Karcher pressure washer accessories. Contains 20 pieces. Contains O-rings for Karcher trigger guns, spray lances, high pressure hoses and optional accessories such as brushes. Genuine Karcher replacement parts. Made in Germany. Compatible with most Karcher consumer electric pressure washers.