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Unlike bulky balloon systems, EQUASHIELD® has streamlined the design by creating a unique closed internal equalization system which makes it sleek and easy to use. EQUASHIELD® is a Barrier type CSTD which internally equalizes pressure differentials, using a unique encapsulated syringe containing a sterile air chamber and a dual needle design, enabling an air to liquid exchange. This unique system eliminates additional steps when equalizing pressure within the system.