I am changing airhandler (5 ton 2 stage ECM) the new is a R-410A TXV however only R-22 compatible with orfice this will lower my SEER i have asked local techs and suppliers if the old R-22 TXV can connect to new coil or will i have to cut & braze old TXV coil tubing, no one can answer, i have come to note they are not technical inclined however know how to change out equipment ... can any one state if the connection (pipe nuts) are same size & thread for both R-22 & R-410A TXV's