Parker ARO® 50 Series General-Purpose pneumatic, air quick coupler has up to 300 psi connect with 50 Series Nipples and is interchangeable with ARO 210 couplers. Has manual sleeve, single shut-off quick couplings. Integral sleeve guard resists accidental disconnection. Tubular valve delivers high air flow with minimal pressure. For use where low pressure air or fluid lines, requiring fast and easy connection and disconnection.