Buy O-ring 28x2,65 598949801 Wolfswinkel your Gardena specialist
O-Ring Gasket 100pcs for all 16x2.5x11mm hose systems e.g. Gardena etc | eBay
Gardena 5/8 in. Rubber Hose Washer And O-Ring Set - Ace Hardware
Gardena O-Ring: Versatile Sealing Ring for Connecting All Original Gardena System Connection Nipples Such as Showers and sprinklers (5303-20) : Amazon.com.au: Garden
Amazon.com: GARDENA 31128 Replacement Garden Hose Washer and O-Ring Set, No Size, No Color : Patio, Lawn & Garden
Gardena 5303 Accessory O Ring — Two Wests & Elliott Ltd