The Watts LF957RPDA is a reduced pressure detector assembly (RPDA). It is available in 2 1/2″-10″ sizes and has been in production since 2013. The body is made of stainless steel. The Watts LF957RPDA utilizes a 3/4″ LF919 for the bypass assembly. The LF957RPDA is a Watts private label of the Ames LFC500.