7000900003, 3/4″ NPT External Relief Valve By suyash | November 25, 2018 - 6:38 am |November 25, 2018 Featured 7000900003, 3/4″ NPT External Relief Valve with a Pressure Setting of 19.3 bar, Cavagna Make Widely used in LPG Pipelines in Bottling Plants. Bookmark the permalink.