Abstract: A restrainer for connection to the belled end of a female pipe or fitting. The restrainer has a groove for receiving a compressed, snap-fit gripping ring, constructed from two or more rigid segments joined by elastomeric segments. The gripping ring has rows of teeth on its inner circumference, shaped so the spigot end of a male pipe can be inserted through the restrainer into the belled end of the female pipe. The gripping ring restrains the male pipe from moving in an opposite direction when the system is pressurized. The coupler can be connected to the female pipe in several ways: it can be threaded onto a threaded lip of the pipe; a projection formed on its outer diameter or its inner diameter can be snap-fit into on onto the end of the female pipe; or it can be welded or fused onto the outer end of the female pipe.

Abstract: An integrated connection for a manhole having a wall opening defining a peripheral surface and a ring shaped elastomeric body cast in place on the peripheral surface. The elastomeric body includes a foot region cast within the wall thickness of the manhole and connected to a leg region. The leg region terminates in a primary sealing surface. A reinforcing element passes through the ring shaped elastomeric body at one circumferential location which, when viewed in cross section, appears below the peripheral surface of the wall opening once the gasket is cast in place.

Abstract: An integrated connection for a manhole having a wall opening defining a peripheral surface and a ring shaped elastomeric body cast in place on the peripheral surface. The elastomeric body includes a foot region cast within the wall thickness of the manhole and connected to a leg region. The leg region terminates in a primary sealing surface. A reinforcing element passes through the ring shaped elastomeric body at one circumferential location which, when viewed in cross section, appears below the peripheral surface of the wall opening once the gasket is cast in place.