【Fast Spring-Powered Cleaning】 Uses spring pressure to flush the brew head with 280ml per cycle. Just 2–3 rinses for deep, residue-free cleaning. Saves time, improves espresso taste and machine hygiene. 【Automatic High-Pressure Protection】 Built-in high-pressure protection valve automatically releases excess pressure during backflushing to prevent seal damage. Holds 200ml and drains fully to the drip tray. 【Food-Grade Materials】 Made of transparent food-grade polymer resin for clear visibility. Includes replaceable silicone plug, stainless steel spring, and high-pressure valve—safe, hygienic, and durable. 【Multifunctional Safety Design】 Supports overflow drainage at high water levels. Dual pressure-release outlets and an extra safety valve protect your machine during daily maintenance. 【Wide 58mm Compatibility】 Precision-sized for all standard 58mm E61 brew head coffee machines with pump and backflush systems. Perfect for routine cleaning and upkeep—please verify your machine model if unsure about compatibility.