Gardena ORIGINAL Replacement Connector SB Washer and O Ring Set
"The Gardena Washer Set includes a Washer and three O-rings. The Washers are suitable for the Gardena Threaded Tap Connectors with the Art. No. 901-50 and 2901-20.
After the exchange, the Threaded Tap Connectors seal again to 100%, no water is wasted."