Will fit Experimental, Cessna and others that mount in a 2 inch hole. Eyeball Swivel Air Vent 2252-2C. The mounting hole needs to be 2" inches. The flange is 2-1/4 . The hose adapter will accept a 2" SCAT hose or the plastic cup on a Cessna aircraft (1.925) The air outlet is 1.20. Black anodized aluminum construction. These are new vents and will be backed by the manufacture for 1 year from purchase.