Abstract: A valve fitting insertable in a gas service pipe coupling for operably effecting gas flow interruption in response to either an encountered excess flow or in the event of a piping disconnect from the coupling. A tubular, stepped diameter valve body is sized for receipt within a pipe coupling to define an annular flow passage internally forming an annular seat at an intermediate location within the passage. A more or less T-shaped poppet having a scalloped faced hex head is spring biased in opposition to the gas flow and cooperates with the body seat to interrupt flow in response to an increasing flow pressure being exerted against the head. A pullout plate encircling the poppet shank is biased toward seating the poppet against the body seat for separately arresting gas flow there-past but is prevented from doing so when a pipe section is positioned in place within the coupling.