A vent and fluid transfer fitment for sealing and transferring a fluid from an inverted fluid-filled container without premature leakage to a receiver attachment, has a transfer check valve and a venting check valve which are preferably duckbill valves. The transfer check valve is attached to the fitment...http://www.google.com/patents/US6612344?utm_source=gb-gplus-sharePatent US6612344 - Integrated vent and fluid transfer fitment
