When using my 5# CO2 tank to push finished beer from my Speidel fermenter to my 5 gal keg (via a closed-system racking cane at ~5 PSI), the CO2 tank regulator ices up/freezes up to the point that the flow from the Speidel to the keg slows to a crawl. I'm fearful that the icing up will damage/break the regulator dial, so abandoned it and used a standard racking cane to get the beer into the keg. Any suggestions as to how to prevent that so I can reattempt the closed-transfer process? Ch(B)eers!