engineered with a durable brass body and stainless steel trim to provide superior corrosion resistance and consistent performance

Direct OEM Replacement: Replaces legacy and obsolete part numbers including HD42AQ243

as the radially-split cast iron body can remain in-line during maintenance

it specializes in regulating normally open dampers by resetting the velocity setpoint between adjustable minimum and maximum airflow limits

making it the industry standard for intermediate pressure regulation where safety and flow consistency are paramount

Trane RNG0070 O-Ring 321702-401 engineered with a durable brassSz#256 Neoprene O Ring