The Canty QUICKPORTTM is a patented, safe, quick opening closure for process vessels. Originally used in the offshore diving industry as a transfer lock on decompression chambers. QUICKPORTSTM are used with no additional interlock by various non-industrial personnel in applications where any operational failure would be fatal. The zero leak design has been proven through a combination of air and liquid submergence testing. This cycles the QUICKPORTTM through external pressure, no pressure and ultra high internal pressure leak testing where a constant o-ring seal was maintained.