The Apollo RPDA-4ANLF is a reduced pressure detector assembly (RPDA). It is available in 2 1/2″-12″ sizes and has been in production since 2011. The 2 1/2″-8″ body is made of stainless steel. The 10″-12″ body is made of ductile iron with a fused epoxy coating. The RPDA-4ANLF is an “N” shaped pattern device. The RPDA-4ANLF utilizes either a Type I or Type II bypass.