Watts B911S Boiler Combination Fill Valve and Backflow PreventerThe Watts B911S Boiler Combination Fill Valve and Backflow Preventer is a durable, space saving solution for maintaining proper boiler fill and backflow protection in hydronic heating systems. With its bronze body and precision engineering, this unit delivers dependable performance in both commercial and residential settings. Designed for a 1 2 inch nominal size, the Watts B911S combines a high capacity fill valve with a backflow preventer to

It’s crafted to withstand typical residential use while preserving the safety features that keep family spaces secure

Its rectangular horizontal cover houses a compact 1

this aquastat snaps onto the convector without invasive wiring or tools

this replacement part delivers dependable compatibility and a straightforward install for homeowners and technicians alike

1-Set Point

RoHS compliant

Brand: Trane

Type: Disposable pleated media air filter

Operating from 50 to 90°F with 0–90% humidity (non-condensing)

Upgrade your steam heating setup with a purpose-built air vent that combines compatibility

Pressure: 5–125 PSI AC

Type: Automatic vent limiter