Gravity!, as long as you have a lenght of tube running upwards from the T...
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Or use the T with a lenght of tube with a stop/ball~valve on the end, when you want to fill it just add a tube going to a funnel onto the ballvalve, just run the PC while open to allow air to escape. if the lenght of tube between the T and valve is a few inches long it'll act like an airtrap anyway...
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