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 - Spray disinfectant cleaner into overflow.
DO - If bath tub is slow draining and has the lever at overflow
for stopper, remove bolts, and pull wire, lift lever out and
clean hair from wire.
DO - Oil parts in toilet tank that are above the water level,
handle and ballcock valve.
