What is the Barb O.D. dimension for Poly (PE) Pipe Insert Fittings?

Insert fittings which are designed for Polyethylene (PE) plastic pipe are manufactured to the ASTM-D2239 standard. The chart below has both the average pipe inside diameters (I.D.) and the PE pipe insert barb O.D.

See article:

https://support.boshart.com/what-type-of-poly-pipe-are-insert-fittings-designed-to-work-with

CAUTION: Not all adapters are made equal, be careful when purchasing that you do not purchase a sub-standard adapter which may not have a sufficient diameter and may put your system at risk of pipe blow off. See the article below:

https://support.boshart.com/insert-fitting-pull-off-resistance-testing

Also make sure to not use a hose barb fitting! See the article below:

https://support.boshart.com/why-do-insert-fittings-for-poly-pipe-pe-have-barbs-with-slightly-larger-diameters-than-the-i.d.-of-the-pipe