This Milton S-638 Inline Air Flow Regulator is the perfect addition to your air hose setup. With a 1/4" female NPT and 1/4" male NPT, it allows for easy connection and disconnection of your air hose. Brass material ensures durability and longevity, while the shut-off application allows for precise control of your air flow. This package includes one Milton S-638 Inline Air Flow Regulator, with a model number of S638. It is suitable for use with air and non-corrosive liquids, and comes with a 1-year manufacturer warranty. Made in the United States, this high-quality air hose accessory is a must-have for any DIY enthusiast or professional mechanic.