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 - Keep these items away from the toilet.
DON'T - Let the children play in the bathroom with toys small
enough to go down your toilet trap.
DO - Get in the habit of putting the back of the toilet seat
down before flushing.
DO - If you have a water leak from below your bathroom directly
below Your bath tub shower, and it only leaks when YOU take a
shower, here's what to look for: