The Gaggia Brew Group Service Kit is the official kit for cleaning and lubricating the brew group on your Gaggia super-automatic espresso machine. Each kit includes food safe lubricant, a pipe cleaner, and three o-rings. The lubricant allows the mechanical components of the group to slide easily, preventing mechanical wear, while the o-ring creates a seal that prevents leaks and allows your machine to reach the necessary pressure for espresso extraction. We recommend lubricating your brew group once every 3-6 months, or every 500 cups brewed and replacing your brew group o-ring once annually. To remove built up coffee oils from your machine's spouts and shower screen, please use the Gaggia Coffee Clean Tablets. 2 coffee group O-RING 40 mm 1 coffee group O-RING 46 mm 1 tube of grease for the brew group 1 mini cleaning brush