Excellent OEM gasket ... remove the screen (Philips screw), then remove the group-head (Allen Wrench), then use a short pointy tool (long handled small screw-driver or a long pointed steel pick to dig up the old gasket - then PULL until it all comes out --- clean the space with a flathead screwdriver. LUBE the grove and the sides & bottom of the new gasket with some food-grade lube (order this from Cerini or any other Espresso site) ... in emergency use a bit of cooking oil (this will leave a taste for the first 2 shots). Then push the gasket (with unit upside down) down fully seated into the groove .. You're Done !! EXCELLENT SHIP - FAST AND OEM PART AT GREAT PRICE.