Some Information about Plumbing and Plumbing tools
A double check valve or double check assembly (DCA) is a backflow prevention device designed to protect water supplies from contamination. It consists of two check valves assembled in series usually with a ball valve or gate valve installed at each end for isolation and testing. Often, test cocks (very small ball valves) are in place to attach test equipment for evaluating whether the double check assembly is still functional.
Some Plumbing DOs and DON'Ts
DO - Open drain at bottom of hot water tank and drain.
DO - Remove all water from toilet tank and bowl.
DO - Put permanent Anti-freeze in toilet bowl and a small amount
in the bottom of the toilet tank.
DO - Put anti-freeze in all sink drains and bath and shower
drains, enough to fill the traps.
DO - If you wish, remove traps on sinks, but be sure and plug up
open line, to keep out sewer gas fumes.
