Spears SCH 80 EPDM Reinforced Threaded Gate Valves This solid, proven design is well suited for a variety of chemical, industrial and irrigation applications. Spears® Gate Valves are feature-packed with multiple end connector options. Individual special features are found in each size range 1/2” through 2”, 2-1/2” & 3” and in the full featured Heavy Industrial 4” valve.