Any of the hard plastic tubing. It dries out and cracks. One that many miss starts from the valve behind the brake master cylinder and routes under the AC / Heater [ACC] fan box, under the battery and into reservoir in the right front fender.
It can be replaced with any quality vac hose. Be sure to save some of the plastic line to make connectors into the right angle and "Y" hose fittings.
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