Do you mean that transparent plastic tubing....... and wouldn't heat from the engine be a problem for all this rubber tubing.
I dont know why it is so hard to get or find the hard moulded plastic tubing it seems ridiculous
Back in the day before they came up with plastic tubing that turns brittle and breaks they used rubber tubing. It will out last any plastic stuff. If you want the best then you can get silicone tubing. It is very much heat resistant.