With a pressure vacuum breaker, however, a drop in the pressure of the water enables the spring to snap the check valve shut. As soon as the water pressure drops, the check valve closes and backflow does not occur.n a pressure vacuum breaker, the water travels through a check valve and causes a poppet to raise up a guide into an air inlet. The air inlet also has a valve which ordinarily remains closed.
Peter Marshall was born Ralph Pierre LaCock on March 30, 1926, to Ralph and Jean LaCock, a show business family, in Huntington, West Virginia. Following his father's death when Marshall was a teenager, he moved to New York City to be with his mother, a costume designer.
Peter was born in the City General Hospital, Sheffield, South Yorkshire, on 17 October 1940, to Elsie Bowers and James William Stringfellow, a steelworker who served in the Royal Scots Greys during World War II.He is the eldest of four, his three brothers are Geoffrey, Paul and Terry.tringfellow first appeared on television as a warm-up act on Ready Steady Go! in 1964. He has contributed to numerous programs, both radio and television, over the last 50 years. He appeared on the celebrity edition of Come Dine with Me, with the first broadcast on 17 September 2008.