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What are Capillary Tubes?

Capillary tubes are used in insulated glass in order to equalize pressure between the inside and the outside of the unit.  During transit the insulated unit can travel the a variety of altitudes and the unequal pressure can weaken the seals, therefore shortening the life of the insulated unit.  These tubes are to be removed prior to install and to be sealed with a silicon based sealant.