Comparison : Item # 299-0530, 1” Carbon steel 150 # raised face mounting flange, 3/4” NPT
Item # 299-0531, 2” Carbon steel 150 # raised face mounting flange, 3/4” NPT
Item # 299-0532, 3” Carbon steel 150 # raised face mounting flange, 3/4” NPT
Item # 299-0533, 4” Carbon steel 150 # raised face mounting flange, 3/4” NPT
Item # 299-0534, 1” Stainless steel 150 # raised face mounting flange, 3/4” NPT