Abstract: A modular connection assembly features an insert secured within an aperture of a wall of a manhole and includes a first cavity having a threaded region. An adapter includes a second cavity and a first end having a threaded region for engaging the threaded region of the insert. A second end of the adapter is adapted to be secured to a pipe end. According to one embodiment, a boot connects the adapter to the pipe. The second end of the adapter includes a circumferential shoulder that biases a circumferential lip of the boot against the wall. Alternatively, the boot is secured to the adapter using adhesives or clamps. A knockout is secured to the insert and includes an internal membrane region and an exterior membrane region having a protrusion extending generally outwardly beyond the internal membrane region.