The Ames LFC500N and LFC500Z are reduced pressure detector assemblies (RPDA). They are available in 2 1/2″-10″ sizes and have been in production since 2013. Their bodies are made of stainless steel. The LFC500N is an “N” shaped device and the LFC500Z is a “Z” shaped device but they share the same parts. Both utilizes a 3/4″ LF919 for the bypass assembly. The Watts LF957NRPDA and Watts LF957ZRPDA are private labels of the LFC500N and LFC500Z.