Hex Bushing Body Material Malleable Iron Class 150 Pipe Size 4 in x 1-1/2 In. Connection Type MNPT x FNPT Max Pressure 300 psi@150 Degrees F Saturated Steam Pressure 150 psi Hex Size 4-5/8 In. Temp Range -20 Degrees to 150 Degrees F Standards UL Listed FM Approved Meets ASME B16.3