Please note that although the gaskets are strong under compression, you should never use a sharp tool like a screwdriver to install them. This may tear the silicone. We have found that the replica E61 groups made these days are pretty much all the same, the different machine manufacturers then use either an 8mm or an 8.5mm group gasket. The thickness of the gasket will determine the “lock-in” position of the portafilter handle. Ideally you want the handle to lock in directly towards you (5 o’clock to 7 o'clock position). If the gasket is too thin it will lock in too far. If the gasket is too thick it will not lock in enough. Item: E61 mm Product size: Approx. 73mm (OD) 57mm (ID) 8mm (Thickness) Product weight: Approx. 18g Colour: Red Material: Silicone rubber SGS food test report: Please click here Machines fit: All E61 Modern Replica groups such as Isomac QuickMill Rocket MyWay BFC VBM Brasilia B61 groups Faema E61 group, Lever groups, E64, No-Stop La Pavoni – some machines such as their E61 group Futurmat Ariete Wega E61 style group ECM ECM Germany Profitec Lelit Expobar Kees van der Westen Speedster etc This item is non-refundable. Please check your original gasket thickness for confirmation, i.e. 8mm or 8.5mm since machine manufacturers choose their own thickness. Cafelat UK Limited is not responsible for any incorrect purchase.