Quote:
Originally posted by the creature
Doesen't you just put water in the air-trap to fil it and then the air-trap does the draining part?
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Only if the outlet of each preceding component is at the highest point of that component as you bleed through (otherwise you need a valve at the highest point of that component).
That's how I see it anyway. Think of underground caves full of water but for an air pocket at the top.
Or better still, an upturned funnel pushed into a sink full of water - it will hold air as long as you keep a thumb on the top but will fill with water as soon as you release the thumb.
This could apply to vertical mount rads for instance - with the barbs at the bottom, it's easy to trap air at the top, even with an airtrap, unless you can bleed it in an orientation where the barbs are at the highest point, then reorient it to suit.