includes genuine MAC valve 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 may or not come with our "Circuit Se7en" decal. The valve will be marked/identified in some way to endure that it was sourced from Circuit Se7en and is a genuine MAC valve.