Regulator Inlet Nipples 1/4 (NPT) 3 1/2 CGA-500; CGA-510; CGA-580; CGA-590 Western Enterprises Regulator Inlet Nipples WARNING: This product can expose you to Lead a chemical known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov Length [Nom]: 3 1/2 in Wt.: 0.22 lb CGA No.: CGA-500; CGA-510; CGA-580; CGA-590 Gas Type: Acetylene (POL); Air; Argon; Helium; Medical Mixtures; Nitrogen Material: Brass Thread Size [Nom]: 1/4 in (NPT)