Show or Hide

Support - Helpful Tools and Resources

Watts Backflow Preventer Retrofit-Spools Approvals

Replaces your old or ineffective backflow preventers with a fast and flexible approach.

USC Approvals Explanation Download

Size Model ASSE FM Lead Free† UL ULC USC
All Sizes


OS&Y - Outside Stem & Yoke
NRS - Non-Rising Stem
BFG - UL/FM Gear Operated Groved Butterfly Valve
LF - Specifies Replacement Parts Only

Get Adobe Acrobat

Please Note: Watts literature requires Adobe Acrobat Reader to view.

Got Feedback?