I bought a house and it came with a Flexcon fl-7 pressure tank, the tank tee started leaking so I took everything apart and went to look for a replacement and no local hardware stores had this tank tee in stock since you need a female end on the tank connection side. So at my local plumbing supply house, they had ones made by American Grandby with a union and without union, so I bought the one with the union but could not get it to thread properly, like the union coupler wasnt big enough to grab enough threads so I went back and returned it and got the non union one. Did anyone ever come across this issue before? Seems like all the hardware stores here carried the tank tee that screws in to the bottom of the tank but the Flexcon tanks hae a special plastic pipe that comes out of them, I dont even know if they are replacable. See attached picture.