Cross Malleable Iron Not Applicable ASTM A197 Class Class 150 For Pipe Schedule 40 3/8 in Female NPT 1 in 18 3/8 In.-18 3/8 in Female NPT 1 in 18 3/8 In.-18 3/8 in Female NPT 1 in 18 3/8 In.-18 3/8 in Female NPT 1 in 18 3/8 In.-18 300 psi Maximum Operating Pressure