Regulator Inlet Nipple 1/4 in (NPT) 3-1/2 in CGA500;CGA510;CGA580;CGA590 w/Filter 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 Includes: Filter Material: Brass Thread Size [Nom]: 1/4 in (NPT) Gas Type: Acetylene (POL); Air; Argon; Helium; Medical Mixtures; Nitrogen CGA No.: CGA-500; CGA-510; CGA-580; CGA-590 Wt.: 0.21 lb Length [Nom]: 3-1/2 in