Abstract: A pig launcher/receiver (10) having a quick-coupling action when being secured or removed from a pipeline or similar conduit. The pig launcher/receiver (10) generally includes first and second fittings (24, 26) that are coaxially aligned with each other, and sealing elements (32, 34) for sealing abutting axial ends of the first and second fittings (24, 26). The first fitting (24) has male threads on an exterior surface thereof. The end of the second fitting (26) opposite the first fitting (24) is closed, thereby forming a cavity (52) within which at least a portion of a pig (20) can be received. The closed end of the second fitting (26) includes an inlet/outlet (50) for venting the cavity (52) between the pig (20) and the closed end, thereby enabling the pig (20) to be more fully received within the cavity (52). The pig launcher/receiver (10) further includes a sleeve member (28) circumscribing the second fitting (26) and threadably engaged with the male threads of the first fitting (24).