McMaster 4638K242 Low Pressure Pipe Fitting, Galvanized Iron, 90° Elbow Adapter, 3 NPT Female × Male, Class 150 48Z207 Rectangular with Floating Nut Rectangular with Floating Nut Fittings with a female threaded end have a hex bushing (also known as a female spud) that connects to a male interlocking clamp hose fitting 90° Elbow Adapters — Female x male 90° elbow adapters are also known as street elbows Pressure Rating Low Pressure Shape 90° Elbow Fitting Type Adapter Fitting Connection NPT Female × NPT Male Pipe Size (A) 3 Pipe Size (B) 3 Pressure Class 150 Material Galvanized Iron Maximum Pressure @ Temperature 150 psi @ 72° F Maximum Steam Pressure @ Temperature 150 psi @ 350° F Certification UL Listed Connects To Pipe Class 150 For Pipe Material Galvanized Steel For Pipe Schedule 40 For Use With Air