Product Name: Raised Face Blind Flanges
Size: 18 Inch, DN450, 450 mm
Pressure: Class 300 LB, PN50
Design Standard: ASME B16.5
Material: ASTM A105, Forged Carbon Steel
Face: Raised Face
Usage: Testing Flange, with NPT Holes for Testing


Source: https://www.landeeflange.com/raised-face-blind-flanges-asme-b16-5-a105-18-inch-cl300.html