The H-5 is a metal single joint used to assemble the HJ-6 Flexpipe joint set. This connector can also be grouped with another H-5 to connect a pipe and a surface. The main difference between using this technique and using the HJ-15 connector is that the surface will be aligned with the pipe center and not the tube's edge when using the HJ-15.
The H-5 comes in a nickel-plated version called H-5NP. Be sure to select this version if you need to build antistatic structures.
A Flexpipe Product
For technical details and images, please search for the product using the 80/20 interactive catalogue found here: https://catalogs.8020.net/80-20-Catalog-26/C/.