Replacement silicone valve O ring for the Mash & Boil. This goes inside the Mash & Boil, behind the backnut. It also fits the recirculation elbow of the Mash & Boil with Pump. This O ring is 4mm thick, and 24mm outside diameter.
This also fits the Robobrew valve.
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Feb 11, 2026 by MB
Q: I have an older M&B unit with both the inner and outer gaskets. Do you sell the inner gasket? If not, what are the dimensions of the gasket? Thanks.
A: The inner gasket (the one that fits behind the backnut on the inside of the boiler) is item X16
Dec 24, 2019 by Harry Anderson
Q: Are the inner and outer gaskets the same?
A: Depends on the age of the unit. Older Mash & Boils had two valve gaskets, a small thin one on the outside, and a wider one on the inside. Current production only has a small thin gasket on the outside. We do not recommend removing the Mash & Boil Valve, as this can damage the seal.
