By-Crete manholes are available in a number of standard diameters including 4', 5', 6' and 8' diameters.  In order to satisfy all of our customers’ requests, we offer these with or without manhole frames, covers, steps and other features. Our manholes conform to ASTM C478 and are constructed of 5000-psi concrete with reinforcement bars per ASTM A615 Grade 60.  WWF conforms to regulation ASTM A185. We are a proud supplier of LadTech HDPE adjustment rings.