John Guest PI011221S - 3/8" O/D x 1/8" NPT Male Straight Adaptor

The John Guest PI011221S is a 3/8" O/D (outer diameter) x 1/8" NPT (national pipe thread) male straight adaptor. It is a fitting used in plumbing and pneumatic applications to connect pipes or tubes of different sizes or materials.

The 3/8" O/D size refers to the outer diameter of the tube or pipe that will be inserted into the adaptor, while the 1/8" NPT size refers to the size of the threaded end that will be screwed into a corresponding female NPT fitting.

This specific adaptor is made by John Guest, a manufacturer known for producing high-quality fittings and tubing for various industries including plumbing, automotive, and beverage dispensing.