Hello!! Water boils at 100 c or 212 F at sea level, that's the temp that the water "boils off at! Straight science. The pressure will always be a little higher at cooler temps,so one should be aware that you should not "jazz" the throttle when the motor is cold.
I have had a few of these...replaced with a new one every time I overhauled the engine.
http://store.summitracing.com/partde...5&autoview=sku
The last time I installed with hose and no clamps and absolutely no leaks!!! Very clean install!!
http://store.summitracing.com/partde...5&autoview=sku
John