Abstract: An interconnectable locking module having a first portion including an external surface defining a bulbous connector extending along a longitudinal axis; a second portion opposite of the first portion, the second portion includes an interior surface defining a hollow receptacle, and an opposite exterior surface defining a circumferential flange having a tapered channel. The tapered channel includes a channel opening and an opposite closed end. The module also includes a locking ring having an interior circumferential surface insertable over the bulbous connector and engageable with the circumferential flange. The locking ring includes a tab insertable into the channel opening and slidable against a tapered channel surface. A plurality of interconnectable locking module may be joined in series to provide an assembly such as a physical model representing a prototype conduit or a path for a conduit.