Compatibility Precisionfit sealing rings designed for use with Long, E16, Baistdu, 8 & 9 Series, Carimali, Mom, and E61 coffee machines. Compatible with the models listed to restore proper sealing and brewing performance. Material and durability Made from quality, heatresistant silicone that tolerates temperature steam during coffee preparation. Built for longlasting use without degradation or hardening under regular operation. Function and performance Replaces worn or damaged group head seals to stop steam leaks, maintain correct pressure, and ensure consistent extraction. Proper sealing reduces steam loss and helps deliver fuller, more balanced coffee flavor. Installation and convenience Includes a simple installation tool so you can seals quickly without professional help. Designed for straightforward, loweffort installation during routine maintenance. Practical applications / use scenarios Home maintenance: an aged seal on an E61 or E16 machine to eliminate steam leaks and restore extraction consistency for daily espresso. Small café or office: Keep spare seals on hand for Carimali or 8 & 9 Series machines to minimize downtime during busy service. Preventive service: Install silicone rings during scheduled maintenance on Long, Baistdu, or Mom machines to preserve pressure stability and extend equipment life. What you get Heatresistant silicone sealing rings sized to fit the specified models and an installation tool for easy replacement. Restores sealing function and helps improve brewing reliability and taste.