[BR3W CITY]

The steam lines themselves are hard tubing with banjo-ends that fit onto the block fittings. If your referring to the vent line that you run from the steam crossovers into the water pump/high point, then any heater hose will work fine. The steam isn't really hotter than anything else contained within the lines (by enough to matter). I wouldn't use it for the steam crossover itself tho.