The Influenza A virus subtypes that have been confirmed in humans, ordered by the number of known human pandemic deaths, are: 1  H1N1 caused Spanish Flu and the 2009 swine flu outbreak (novel H1N1) 2  H2N2 caused Asian Flu. 3  H3N2 caused Hong Kong Flu. 4  H5N1 is bird flu, endemic in avians. 5  H7N7 has unusual zoonotic potential.
Plug seal capsfeature one-piece linerless construction and. are designed for use in closed systems, providing a liquid-. and gas-tight seal. When loosened, this cap can also be used. in open systems. This cap design was a Corning innovation. that first appeared in 1974.
The simplest and most common general type of plug valve is a 2-port valve with two positions: open to allow flow, and shut (closed) to stop flow. Ports are openings in the valve body through which fluid can enter or leave.