Refers to a fluid piping system in which flow impinges on a lead-filled end (target) or a piping tee when fluid transits a change in direction.

1.

A tool for forming an internal screw thread.

It consists of a hardened tool-steel male screw grooved longitudinally so as to have cutting edges.

2.

A hole or opening in a line or vessel into which a gauge or valve may be inserted and screwed tight.

v.1.

To form a female thread by means of a tap.

2.

Extract or cause to flow by means of a borehole, e.g., to tape a reservoir.