This code is specifically for a single 5-star hub shipped to Canada.
These pentagonal predrilled 5-arm PVC connectors for ½ inch pipe are injection molded with a 10 degree inward curvature. Each arm has exactly one inch of sleeve room for the inserted pipe, and a bolt hole is predrilled 1/2" from the end of each arm.
The center is solid PVC (hardcore), so you can screw your cover into it from the top or bottom, depending on what kind of cover you choose. Although each arm has been designed to resist over 100 pounds of angular force, domes built using these hubs are not for climbing.
Although Sonostar has focused on the Frequency 3, 4, 5, & 6 domes that use 4-star, 5-star and 6-star connectors, there are designs that call for using all 5-star connectors, and these should work well in those concepts. Just be sure that if you use another website's strut-length calculator that you deduct 2.28 inches from the centerpoint-to-centerpoint lengths, otherwise your pipes will be too long.