1/4" Brass Cap. It is Lead-Free compliant, meeting Public Law 111-380. Suitable for brass or steel pipe, this one-piece construction offers fair vibration resistance and is ideal for low to medium pressure applications. Teflon tape or pipe sealant is recommended for a secure fit, and pipe threads should be tightened 2-1/2 turns past finger tight.
WARNING: This product can expose you to lead, a chemical known to the State of California to cause cancer and reproductive harm. www.P65Warnings.ca.gov