Looking up Tygon information, I find a lot of motorcycle folks tried to use it ( Tygon 2375 = bad? but F-4040-A = better? ) , but based on my quick searches, the Tygon 2375 at least seeped/leaked for them. Who knows what percentage have an issue with it vs. not, but it seems like most OEM use EPDM rubber hose for these types of things, and it's less expensive. Not transparent hose, but that isn't a huge deal for me.