Feature: 1. Keep Keg Pressure Safety: Pull up the release valve ring to release excess and extra pressure before opening the keg, which keep home brewers safe during carbonation process, a must have for home brewers. 2. Easy to Use: This carbonation keg lid pressure release valve is designed with installation spring and pull up ring, just twist and insert into keg lid to install and pull up the release valve ring to use. 3. Quality Material: This pressure relief vaves are made of 304 stainless Steel, healthier and more environmental and durable than the plastic one. 4. Widely Used Gadget: Ball lock keg pressure relief valve fits most carbonation lid of various model ball kegs. 5. Good Workmanship: Exquisite workmanship, beautiful appearance, portable size, providing you great using experience. Specification: Item Type: Ball Lock Keg Pressure Relief Valve Matexrial: Plastic, Stainless Steel Color: As Pictures Shown Weight: Approx. 50g / 1.8oz Product Size: Approx. 5.7x3x1.7cm / 2.2x1.2x0.7in. Package List: 4 x Pressure Relief Valve