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CarloSW2,
I don't think the drainage thing at the bottom is for high pressure; I believe it's the petcock for you to drain and flush the system. The high pressure release on your car I would bet to be off the radiator overflow tank - water overflows into it as it expands, and if the rad. boils over, water leaks from the overflow tank.
That said, the petcock is not a problem to cover up, if that's what it is. I never use it - much less risk of breaking something to just take off the lower rad. hose. I broke the petcock on a '73 corvette I was helping a family member with; I felt horrible!
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