This 3-way solenoid valve is used quite often in controlling unloader valves. This valve can operate at pressures up to 450 PSI. This valve features a stainless steel body with 1/4 female NPT inlet and outlet connections, venting is on top of coil. This valve is NC and will open when energized. This valve utilizes a 240-VOLT coil, which should be the same voltage as your timer, if used.