I have had to replace almost all of my lines on my 2008 FSC3200. Most of the lines had short lengths of braided vinyl tubing running from the faucet connections to PEX. The plastic connectors failed (cracked) where the PEX was joined to the braided vinyl tubing on the braided vinyl tubing side. I believe the crimps that the factory used were too tight on the connectors. I did away with the braided vinyl tubing and factory connectors. I now have PEX for the whole system. I used Sea Tech reusable fittings to connect it all together. The Sea Tech fittings are much more robust than factory style and lighter than brass style found at home improvement stores. Some of the lines were a pain, but doable. I bought the fittings through Fresh Water Systems.