The Rocket Brew Head Gasket seals the portafilter to the machine and keeps the pressure where you want it --on the puck! This is an OEM gasket direct from Rocket. It's 8mm thick, which is the size that ships with new Rocket machines.
Pro Tip from the SCG Crew: This gasket means your portafilter will tighten over more towards the right to lock into place. You may be interested in the 8.5mm brew head gasket if that is not your preference. Both gaskets get the job done!
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http://www.seattlecoffeegear.com/seattle-coffee-gear-tune-up-kit-for-rancilio-silvia Aug 13, 2013
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