All brass hose reducer which resists rust and will not corrode as easily as other materials. Use to connect 3/8 In. air hose to 1/4 In. air hose. Thread Size: 3/8 In. MPNT, 1/4 In. MNPT Material: Brass WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. - Lead