Sonostar has designed our geodesic hubs for the specific use of building geodesic domes and spheres. Sonostar hubs are available in both Standard and Mega sizes. The Standard dome connectors are designed to fit ½” Schedule 40 PVC pipe, and the Megahub dome connectors are dual-purpose, designed to fit either 1” or 1 ½” Schedule 40 PVC pipe, depending on whether the pipe fits inside or around the hub arms. All our hubs (geodome connectors) come in 4-star, 5-star, and 6-star designs. All of them have molded bolt holes for easy assembly.