Amazon.com: 54mm Silicone Steam Ring – Durable, No BPA Grouphead Gasket Replacement Part – Compatible with Breville Espresso Machine 870/878/880/860/840/810/450/500/ Sage 500/810/870/875/878/880: Home & Kitchen
Steam And Water Coming Out Of Group Head (Breville Barista) – Jontic
Breville 54mm Replacement Group Head Gasket | Cape Coffee Beans