Abstract: The present invention relates to plumbing for toilet tanks, and more specifically provides an alarm system for indicating a failure mode in a toilet tank's operation. One preferred embodiment of the present invention utilizes a floating magnet and sensors positioned near the top and bottom of the tank which activate an alarm when the magnet becomes sufficiently close to either sensor. The alarm can be audible or visual. In other preferred embodiments, the alarm closes the tank inlet valve or the tank exit valve to control normal operations, or to correct malfunctions.

Abstract: A locking cam-type coupling for rapidly coupling two pipe sections together. A spring-biased lock pin is provided for each cam lever arm that has a positive locking action when the cam lever arm is moved to the closed position. Each cam lever arm is grooved to allow the spring-biased lock pin to contact the cam lever arm and control its position. The lock pin has two different diameters, one for locking the fitting to the complementary part of the pipe coupling to couple the pipe sections together, and a second, open position so the pipe sections can be released and decoupled.