Features:

For pneumatic tool lines.
One-way automatic shut-off valve in the socket.
Ideal for such applications as factory air supply.
Pneumatic tool coonections, etc.
Many types for a wide variety of applications.

Interchangeability.....

(1)All NL-22 (1/4"), NL-23(3/8"), and NL-24(1/2") model numbers are interchangeable.
(2)All NL-44 (1/2"), NL-46(3/4"), and NL-48(1") model numbers are interchangeable.
(1) and (2) are not interchangeable with each other.