The FT206 retain sensor is a bottom retain detection sensor and part of the FloTech brand retain/overfill monitoring system. The sensor has a 1/2" NPT mounting. Sensor comes with a 1/2" NPT weld-on aluminum half coupling for mounting. The main sensor portion is stainless steel to prevent galling in the trailer. The wiring box is plastic to prevent corrosion and is removable to facilitate installation. The side ports come out of the same side (like the overfill sensors) to make wiring easier. The FT206 is mechanically and electrically compatible with the Civacon model 1000 two wire retain sensor. Our new three port housing design is compatible with previous inline and parallel dual port housings.