ITEM NAME:Brass 1/4" Threaded Full Ports One Way Air Check Valve Gas Valve Tool Val D R7F5 HOT SALE body .shopclass { float: left; width: 100%;.Connection: Threaded. Made of Brass material, have corrosion resistance and good flexibility. Material: Brass. 1X One Way Air Check Valve. You can follow below process to chontact us. repetition is good, easy installation and maintenance, job security and.