Product Name: ASTM A182 F44 Slip-On Flange
Design Standard: ANSI B16.5
Material: ASTM A182 F44, Forged Stainless Steel
Size: 1 Inch, DN25
Pressure Rating: Class 150 LB, PN20
Source: https://www.landeeflange.com/ansi-b16-5-slip-on-flanges-astm-a182-f44-1-in-cl150-dn25.html