• Packed Spool Type Air Valves • Compact Design Allows Maximum Air Flow Through Small Body Sizes • Aluminum Bodies • Stainless Steel Spools • Buna-N Seals • 4-way 3-position closed center valves are for controlling a double-acting cylinder where the cylinder DOES need to stop mid-stroke. 4-way 3-position open center valves will vent the work ports in the center condition • Minimum Pressure is 29 PSI for the 1/8” NPT Ported Valves and 35 PSI for the 1/4” NPT Ported Valves (Minimum Pilot Pressure) • Manual Overrides Standard • Mount In Any Position • 145 PSI Maximum