Working on a Lennox HP with CB30M-31-1P A/H, took the R22 TXV apart to check the screen. Do I have to replace the blue Teflon washer/seal (between the TXV and LL stub, seems like a Chatleff fitting) or can re-use? Anyone knows the replacement seal p/n? TXV p/n seems to be 56J19, Lennox dealers here please confirm. THANKS!