Line valve STF Line Valve is a user-friendly product used in agricultural irrigation processes, with its easy installation. Technical Specification Code Ball valve STF ball valve is used under the sprinkler, it is a user-friendly product with its easy installation, it is designed to be able to open and close water easily without expending extra effort. Technical Specification All the data sheets, schematics, manuals, photos and descriptions are for general purpose use only. Please contact nearest STF specialists for further information or technical support. The company reserves the right to change the design of their products without prior notice.