Quick Shut In Tool
The down hole Shut In Tool will eliminate the wellbore storage effect and significantly reduce the shut-in time during pressure build up.

Product Features

• Instant Close Time

• Multiple Cycle Capabiliy

• Metal to Metal Seals

• Eliminates Wellbore Storage Effect

• Modular Design

Link:
http://www.interwell.com/shut-in-tool/category658.html