Watts 0590719 Air Vent but compatibility depends on the

but compatibility depends on the specific orifice size and body material

For standard 24 VAC circuits

This cover is specifically designed to work with the blue replacement impeller used in most standard 5-gallon bowl configurations

While some sources list cross-compatibility

Watts 0590719 Air Vent but compatibility depends on theThe Watts 0590719 is a high performance 1 8 inch NPT air vent designed for veteran contractors who require reliable air elimination in pressurized hydronic heating systems. Engineered as a direct replacement for the DUOVENT 1 8, this unit features a rugged brass body and cover capable of handling system pressures up to 150 PSI and temperatures reaching 240F. Its unique dual function design incorporates an automatic vent with a black cap for continuous