This Zinc Plated Durable Brass Material Push to Connect (PTC) Straight Pneumatic Fitting accepts 3/8" O.D (outer diameter) hose, and the threaded end is ½" NPT. Maximum pressure of 250 PSI. Ideal for Suspension Applications. ½" NPT Push to Connect (PTC) Straight Pneumatic Fitting (4 Pack) Thread Size: ½" NPT Male For 3/8" OD Hose Pressure Rating: 250 PSI Zinc Plated Durable Brass Material Fitting has release button to remove tubing