As it turns out the threads in the solenoid are straight 1/4? and not NPT. After a trip to two speed shops unsuccessfully trying to find the proper fittings, I re-thought the design. I?ve decided to simplify and go with two manual check valves that have a 1 psi cracking pressure. I?m hoping that using two valves will prevent the smoke dribbling as the lines siphon empty after the system is turned off. I?ll fly it this weekend an let you know. I?m probably just reinventing the wheel here...... sigh
