Abstract: A subassembly is provided which is designed so that two passageways in concentrically arranged tubing strings can be formed to provide a flow-path which in a first direction communicates with equipment at surface in an annular passageway then switches partway along the tubing strings' length in the well to the subassembly and is redirected to the core passageway, and back from the string's lower end up the annular space to the subassembly and is again redirected this time to the tubing's core passageway back to surface equipment; the two passageways being: the core passageway formed of the core tubing's inner volume; and the annular passageway formed of the annular space between the core tubing string and a concentrically surrounding second tubing string's inner surface; the subassembly forming a two-way cross-over between the two passageways at the same part of the string.

Abstract: A lubricator for receiving a plunger is provided. The lubricator has a bore, a first end having a well head connection, a second end having a stem connection, and a plurality of ports, including a catcher port and flow ports. The flow ports are externally threaded nipples that extend radially beyond the outer surface of body of the lubricator.