General

1. A threaded nut, one side of which is dished to retain a grommet; used in forming a watertight pipe […]

Pressure developed in opposition to the flow of liquid or gas in a pipe, duct, conduit, etc.; due to friction,

The placing of timbers, usually set in a diagonal or oblique position, to hold a wall in place.

The flowing back of used, contaminated, or polluted water from a plumbing fixture or vessel into the pipe which feeds

A gutter installed on the uphill side of a chimney on a sloping roof; used to divert water around the