This brass tee is perfect for pressure tank installations where the tank has a 1" Male connection. For example, WellMate WM-6, WM-9, WM-12Tank connection: 1" FMPTThe side ports are 1" MPT / 3/4" FMPTThe top ports are 1/4" FMPT (for pressure switch / pressure gauge)The front ports are 1/2" FMPT (for pressure relief valve / boiler drain)Overall Length: 4 1/2"