Abstract: Systems and methods for stormwater detention. An outer wall comprising L-wall members arranged side by side, each comprising a vertical stem having a height h and a width w, and a base of width w connected to the stem and extending outward therefrom at a horizontal angle. At least a first portion of the L-wall member stems having a pocket extending a distance d from a top surface of the stem towards the base, where d<h. The pockets may be positioned midway of the stem width. At least a second portion of the L-wall member stems devoid of a pocket. Optionally, support walls also having a pocket. A roof of double-T roof members each having a span, a flange, and two webs, the webs having first and second ends engaged with one of the pockets of the stems of the L-wall members.

Abstract: A pipeline connector that is piggable and is reinforced against deformation. At the point where the connector diverges from one pipeline to multiple pipelines, the connector may be surrounded by a tube, forming a space between the connector and the tube. The space may be filled with filler material, such as grout. Thus, radial pressure from the contents of the pipeline may be borne by the tube rather than the connector at the point of divergence. The ends of the tube surrounding the connector may be covered by plates, which may enclose the grout-filled space and which may act as feet for the pipeline connector.

Abstract: A sealing ring having a flexible ring body and a front and rear seal separated by a channel and a set screw recess adjacent one end. The sealing ring is placed on the end of a set screw electrical fitting or connector and forms a seal between the body of the set screw electrical fitting or connector and the exterior surface of an electrical conduit. The sealing ring prevents concrete from entering a gap formed between the body of the set screw electrical fitting or connector and an electrical conduit during pouring of concrete. Concrete entering the gap may interfere with electrical connections.

Abstract: A transition coupling for connecting at least a first and a second piece of electrical conduit is provided, such as for positioning in a concrete slab of a building or other structure. The coupling includes a first opening for receiving the first piece of electrical conduit, a second opening for receiving the second piece of electrical conduit, and a body extending between the first and second openings.

Abstract: A connecting device for providing a liquid tight connection between a conduit and a panel includes a tubular body with a central flange having a forward face and a rearward face, a rear tubular section extending axially from the rearward face and a tubular nose section extending axially from the forward face. This body also has an annular cover section and an annular passageway be formed between the cover section and the rear tubular section. At least one thread is formed on the cover section and projects radially inwardly. A sealing ring is mounted in the passageway adjacent the rearward face and provides a seal between the tubular body and an end of the conduit. A forward fastening device secures the nose section to the panel.