XUEMEI Connector body is PBT material, threaded portion is stainless steel Ball lock air disconnects usually connect 5/16 swivel nut and red air line; ball lock fluid disconnects usually connect 3/16 swivel nut and clear beer wire MFL threaded connection for easy on/off, toggle between Pin Lock, Ball Lock, Sanke, easy to use and clean. This ball lock set attaches directly to older kegs and fits most Cornelius Kegs, Pepsi Kegs and Keg Chargers ; ;Package: Ball Lock Gas Disconnector 1/4 Ball Lock Liquid Disconnector 1/4 ; ;This is a set of MFL (threaded) disconnects for the input (gas) and output (liquid) columns on a Cornelius style ball lock barrel (cola), the Mfl threads are great for quickly changing lines or adding additional equipment without cutting the line