Due to some poor planning on my part I have to redo the air piping in my shop which includes an auxiliary air tank. The easiest way to do things would be to include a ground seat union in the 1/2" steel pipe line. I have used these unions before with natural gas and water but never with the higher pressures in an air system. For the plumbing gurus out there, is this doable ? I know that unions can be persnickety and I do not want to end up with a chronic leak if they are not suitable for air pressures. :wsmile: