VALVE RELIEF 1.25" 250 PSI NH3 A-417-A

The Continental NH3 A-417-A is likely a safety relief valve, which is a 1-1/4 inch MPT (Male Pipe Thread) valve set to 250 PSI with a corrosion-resistant aluminum body. This safety relief valve is designed to be installed in the vapor area of anhydrous ammonia (NH3) containers for agricultural use to protect against overpressure.