The ECM/Rocket Group Gasket fits all ECM & Rocket espresso machines.
On the E61 grouphead machines the group gasket holds the shower screen in with compression--they must be removed together. As the fit can be slightly different in each individual grouphead depending on the make and/or age of the machine, we recommend also purchasing a 0.5mm spacer (EP360) to ensure a proper fit.
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I ordered this with the Rocket/ECM shower screen. Both fit perfectly in my Isomac Millennium.