Ideal for Use with Oil, Fuel, LP, and Natural Gas Pipe Lines (not for Potable Water).
3/8" Long Nut for Flare Pipe Fittings; Brass It is an Essential Component of Every Flare Connection, and Helps Create an Ultra Secure, Leak Free Seal. It Will Resist Mechanical Pull Out and Ensure that your Pipes Won't Leak or Drip. Wash hands after handling. WARNING: Handling of this product will expose you to lead, a chemical known to the State of California to cause [cancer, and] birth defects or other reproductive harm.