A flush valve is a mechanism used to flush a toilet or urinal. The valve and associated hardware are located within the toilet tank or in the body of the urinal. Most toilets have a lever or push button activator, which is used to operate the flush valve.
Photosensitivity (or sun sensitivity) is inflammation of the skin induced by the combination of sunlight and certain medications or substances.This causes redness (erythema) of the skin and may look similar to sunburn.hotosensitivity (or sun sensitivity) is inflammation of the skin induced by the combination of sunlight and certain medications or substances.
While some people are truly more sensitive to sunlight than others and may have a hereditary type of sun allergy, many people use the term sun allergy when, in fact, their reaction to sunlight is caused by use âof various medications or topical agents that cause a reaction on the skin when exposed to sun.