Manufacturer Name: Johnson Controls Product Number: AFS-262 OEM Part Number: AFS-262 Product Description: Air Flow Sw,Adj .05-2" 1/4"Od Weight:1.21lbs/548.85g The Johnson Controls AFS-262 is an adjustable air flow switch which is used for measuring the amount of air pressure in an HVAC system. This portable equipment consists of a diaphragm. https://www.partshnc.com/afs-262-johnson-controls-air-flow-swadj-05-2-14-od