Reduced Pressure Backflow Preventers
0.75-2.5" (GSO-12)
3-10" (GSO-15)
Add-on Meter and Backflow (GSO-17)

Double Check Valves (Approved Fire Lines Only)
1.5-2" (GSO-13)           
3-8" (GSO-14)

Water Tanker Truck Connection (GSO-19)