The manifolds that are in the new packs from cardinal have one-way valve on the waste port.Because of this valve, air can be introduced into the manifold, which is supposed to be an air-less system.Also, the syringes that come in the pack are not able to be refilled quickly enough without introducing air into the syringe.Manufacturer response for namic convenience kit, (brand not provided) (per site reporter): the rep has been contacted in hopes to refund the cost of the kits that were purchased.
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