10" Double Check Backflow Preventer Valve with OS&Y Bypass by Ductile Iron

3" Double Check Backflow Preventor Valve with OSY Fire Protection System by ASTM

2-1/2" Double Check Assembly With OSY Valve

12" Reduced Pressure N Pattern Valve With OSY LF

3" Double Check Valve With OSY LF6 For Fire Protection

10" Double Check Valve with OSY Design for Fire Protection

4" Double Check Assembly by Ames with GXG OSY Valve Fire Protection Backflow Preventor Valve

2-1/2" Double Check Valve With BFG LF For Fire Protection

2-1/2" Reduced Pressure N Pat With OSY Low Flow Valve

10" Double Check Assembly With OSY Valve for Plumbing Use

8" Ames Double Check Backflow Preventer Valve for Fire Protection Systems