this o-ring is designed to fit those legacy control valve specifies

Key Benefits: Direct OEM Match: Fully replaces and is identical to 93J3901 for exact fitment and calibration

Universal Compatibility: Standard 1/4" SAE female flare fitting matches most Lennox liquid line service ports

Specifically designed for the Armstrong 813

Designed for high-capacity commercial refrigeration and HVACR systems

Zonefirst AOBD-10X6 Damper Els PW 17895 this o-ring is designed toAs a veteran tech, you know that airflow control is only as good as the hardware in the duct. The Zonefirst AOBD 10X6 is a professional grade automatic opposed blade damper designed for precision HVAC zoning. Built with a 10" wide by 6" high extruded anodized aluminum frame, this motorized zone damper uses a 24Vac power open power closed actuator to ensure positive position control without the failure points typical of spring return models. The