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The ‘Lisec’ FPS US has a movable seal allowing greater control in filling the unit compared to a Standard press which has a fixed seal flooding the chamber. This new moveable seal allows for a quicker and more accurate gas filling process which will enable the use of high quality gases. The use of higher quality gasses will lead to higher quality performance of IG units resulting in higher rated windows helping to meet all the demands in the commercial and domestic market place.