This beer keg tap is designed with a spring-lock principle, featuring a fully lubricated sturdy gas spring washer inside to effectively prevent adhesion, ensuring stable air pressure output and continuous beer supply. The hose clamp at the connection prevents air leakage, maintaining stable pressure during use. With a simple structure that requires no power supply, gas cylinder, or regulator, it's easy to operate just place the keg in an ice bucket and pump beer out effortlessly via the piston rod handle. The tap body is chrome-plated for durability, rust resistance, and easy cleaning/lubrication, suitable for long-term repeated use. Its 4 in. size fits domestic American kegs like Budweiser, Miller, and Coors, making it ideal for picnics, welcome parties, weddings, family dinners, and other occasions to add drinking fun. It's a practical tool for enjoying draft beer with ease.