You can use any old emissions hose. I'm just going for a more OEM look to the engine bay and a molded, shaped hose suites me very nicely. I'd use a regular VE hose but the angle with which the vent provision sticks out of the valve cover is different. The 20V cover has the provision sticking straight out towards the front grill. The regular VE cover has the provision pointed downward about 45 degrees. Look at Keo's picture about for the 20V example and look up pictures of someone else's regular VE cover for comparison.