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.
Some chemicals contribute to sensitivity to the sun. These can cause two different types of photosensitive reactions: phototoxic and photoallergic. Phototoxic reactions are usually caused when a new chemical in the body interacts with ultraviolet rays from the sun.oxycycline and tetracycline, for example, can cause this reaction. The result is a skin rash that looks like a severe sunburn. These usually develop within about 24 hours of exposure to the sun. Photoallergic reactions can also develop as a side effect of some types of medication.