Size 1 (Size 1 N.C.) Fluid 2 (For Water) Body material/Port size/Orifice diameter A (C37 (Brass) - 1:1/8, 2:1/4, 3:1/4 - 1:2, 2:4, 3:5) Voltage/Electrical entry F (24 VDC - Grommet with surge voltage suppressor) Special Voltage None Other Options F (Low concentration ozone resistant - G) Bracket Interchangeable None