GENUINE MAC valve, (as of late, MAC has omitted the text in the "Country "field of some of their labels, be assured these are genuine, same USA source as always) PWM , 10-30Hz, 15-85% duty nominal, This is for the valve only. Coil Voltage: 12 V-DC Port Size: 1/8 IN Frequency range 10-30Hz. Facilitates robust and easier mounting. User must supply an M6 flat head screw to mount the bracket to their intended object, as each installation requires a unique length. ACE hardware carries these in various lengths. Note: The valve will be marked/identified in some way to ensure that it was sourced from Circuit Se7en and is a genuine MAC valve.