The ERS Pre-combustion chambers are produced with highest quality, precision and with the best materials. The ERS parts are interchangeable with OEM parts. All ERS Spark Plug Sleeves are produced from a premium material, which has a high tensile strength and high thermal conductivity. It is robust, cracks and damages of the threads are less likely and you get a better cooling for the spark plug. Our sleeves are interchangeable with OEM part numbers. We include high quality O-rings with all our pre-chambers and spark plug sleeves. The service interval for ERS spark plug sleeves and pre-combustion chambers is 10,000 operating hours.