Product Name: Customized Metal Seal, Stamping
Type: Metal Seal (Stamped)
Standard: Customized
Material: CS1813
Outside Diameter: 36 mm
Inside Diameter: 30.5 mm
Thickness: 1.5 mm
Source: https://www.landeepipefitting.com/custom-metal-seal-cs1813-od-36-mm-id-30-5-mm-thk-1-5-mm.html