The pre-terminated fiber head being used now requires a 7/8" hole, this is tight but manageable for a straight shot. So a 1" ID conduit would work well for straight through. If your conduit will have bends in it, a 1 1/4 inch pipe is recommended, however, the bigger the conduit, the better (it will avoid problems).
Written by Ron - FiosFAQ-JFOJ
Last updated on 09.08.06