This is a 24" X 1/4" tubing assembly with a 1/4" barb at one end and a MPF fitting at the other. The tubing used for this assembly has thicker walls that help it accept micro-sprayers with a 10/32 threaded end. However, this means this tubing can be difficult to get a standard 1/4" barbed fitting into. Make sure not to over-tighten the component screwed into this tubing as this can weaken the holding power of the tube. If you do over-tighten just cut off a small piece of the tube and start over.