Product Info: Part: Engine Coolant Radiator Cap Material: Plastic Covered Stainless Steel Lever Type: No Shape: Round Cap Depth: 0.96 inches Cap Depth: 24.5 millimeters Filler Neck Height: 0.77 inches Filler Neck Height: 19.5 millimeters Filler Neck Inside Diameter: 1.24 inches Filler Neck Inside Diameter: 31.