Ball Lock Post Cornelius Type Ball Lock Keg Post, Stainless Steel Poppets and Springs Gas Liquid Post with Thread 19/32"& 9/16''|Beer Brewing| - AliExpress
Ball Lock Keg Posts Stainless Steel Poppets and Springs Poppet Female Thread Gas and Liquid - Walmart.com
Poppet Valve (Old Firestone & John Wood Ball Lock Kegs) - O'Connor's Home Brew Supply